{"segment":[{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["5"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai22/lv1/img\/D7B22D1_1.png' \/><\/center> Ng\u01b0\u1eddi ta th\u1ed1ng k\u00ea th\u1eddi gian gi\u1ea3i m\u1ed9t b\u00e0i to\u00e1n t\u00ednh theo ph\u00fat c\u1ee7a c\u00e1c h\u1ecdc sinh trong m\u1ed9t l\u1edbp h\u1ecdc r\u1ed3i l\u1eadp b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d v\u00e0 bi\u1ec3u di\u1ec5n \u1edf bi\u1ec3u \u0111\u1ed3 tr\u00ean theo th\u1eddi gian gi\u1ea3i m\u1ed9t b\u00e0i to\u00e1n t\u00ednh theo ph\u00fat $(x)$ v\u00e0 \u201ct\u1ea7n s\u1ed1\u201d $(n)$. <br\/>T\u1ea7n s\u1ed1 b\u1eb1ng $7$ t\u01b0\u01a1ng \u1ee9ng v\u1edbi th\u1eddi gian gi\u1ea3i m\u1ed9t b\u00e0i to\u00e1n t\u00ednh theo ph\u00fat l\u00e0 _input_ <\/span>","explain":"<span class='basic_left'>Trong bi\u1ec3u \u0111\u1ed3 tr\u00ean: Tr\u1ee5c ho\u00e0nh th\u1ec3 hi\u1ec7n gi\u00e1 tr\u1ecb $(x)$, tr\u1ee5c tung th\u1ec3 hi\u1ec7n t\u1ea7n s\u1ed1 $(n)$. <br\/> T\u1ea7n s\u1ed1 b\u1eb1ng $7$ \u1ee9ng v\u1edbi tr\u1ee5c tung v\u00e0 t\u1ecda \u0111\u1ed9 tr\u1ee5c ho\u00e0nh t\u01b0\u01a1ng \u1ee9ng c\u00f3 th\u1eddi gian gi\u1ea3i m\u1ed9t b\u00e0i to\u00e1n t\u00ednh theo ph\u00fat l\u00e0 $5$. <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $5$.<\/span><\/span>"}]}],"id_ques":941},{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["2009"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai22/lv1/img\/D7B22D1_2.png' \/><\/center> Ng\u01b0\u1eddi ta th\u1ed1ng k\u00ea s\u1ed1 gia c\u1ea7m c\u1ee7a m\u1ed9t \u0111\u1ecba ph\u01b0\u01a1ng trong c\u00e1c n\u0103m t\u00ednh theo ngh\u00ecn con r\u1ed3i bi\u1ec3u di\u1ec5n th\u00e0nh bi\u1ec3u \u0111\u1ed3 \u1edf tr\u00ean. <br\/>N\u0103m c\u00f3 s\u1ed1 gia c\u1ea7m \u0111\u1ea1t $62$ ngh\u00ecn con l\u00e0 _input_ <\/span>","explain":"<span class='basic_left'> C\u0103n c\u1ee9 theo bi\u1ec3u \u0111\u1ed3 ta th\u1ea5y n\u0103m c\u00f3 s\u1ed1 gia c\u1ea7m \u0111\u1ea1t $62$ ngh\u00ecn con l\u00e0 n\u0103m $2009$. <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $2009$.<\/span><\/span>"}]}],"id_ques":942},{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["109"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai22/lv1/img\/D7B22D1_3.png' \/><\/center> Ng\u01b0\u1eddi ta th\u1ed1ng k\u00ea di\u1ec7n t\u00edch tr\u1ed3ng l\u00faa c\u1ee7a m\u1ed9t \u0111\u1ecba ph\u01b0\u01a1ng trong c\u00e1c n\u0103m t\u00ednh theo h\u00e9c-ta r\u1ed3i bi\u1ec3u di\u1ec5n th\u00e0nh bi\u1ec3u \u0111\u1ed3 \u1edf tr\u00ean. <br\/> Di\u1ec7n t\u00edch tr\u1ed3ng l\u00faa \u00edt nh\u1ea5t trong c\u00e1c n\u0103m l\u00e0 _input_ (h\u00e9c - ta) <\/span>","explain":"<span class='basic_left'> Tr\u1ee5c tung bi\u1ec3u di\u1ec5n di\u1ec7n t\u00edch tr\u1ed3ng l\u00faa, nh\u00ecn v\u00e0o bi\u1ec3u \u0111\u1ed3 ta th\u1ea5y di\u1ec7n t\u00edch tr\u1ed3ng l\u00faa \u00edt nh\u1ea5t l\u00e0 $109$ h\u00e9c-ta. <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $109$.<\/span><\/span>"}]}],"id_ques":943},{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["149"],["116"],["133"],["82"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> Ng\u01b0\u1eddi ta th\u1ed1ng k\u00ea s\u1ed1 \u00f4 t\u00f4 c\u1ee7a m\u1ed9t c\u00f4ng ty v\u1eadn t\u1ea3i trong c\u00e1c n\u0103m t\u00ednh theo chi\u1ebfc r\u1ed3i bi\u1ec3u di\u1ec5n th\u00e0nh bi\u1ec3u \u0111\u1ed3 nh\u01b0 sau: <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai22/lv1/img\/D7B22D1_4.png' \/><\/center> D\u1ef1a v\u00e0o bi\u1ec3u \u0111\u1ed3 tr\u00ean, h\u00e3y \u0111i\u1ec1n v\u00e0o c\u00e1c \u00f4 tr\u1ed1ng trong b\u1ea3ng sau: <br\/> <table><tr><th>N\u0103m<\/th><th>2008<\/th><th>2009<\/th><th>2010<\/th><th>2013<\/th><\/tr><tr><td>S\u1ed1 l\u01b0\u1ee3ng \u00f4 t\u00f4 (chi\u1ebfc)<\/td><td>_input_<\/td><td>_input_<\/td><td>_input_<\/td><td>_input_<\/td><\/tr><\/table> <\/span>","explain":"<span class='basic_left'>T\u1eeb bi\u1ec3u \u0111\u1ed3 \u0111\u1ec1 b\u00e0i \u0111\u00e3 cho, ta c\u00f3 b\u1ea3ng s\u1ed1 li\u1ec7u t\u01b0\u01a1ng \u1ee9ng nh\u01b0 sau: <br\/> <table><tr><th>N\u0103m<\/th><th>2008<\/th><th>2009<\/th><th>2010<\/th><th>2013<\/th><\/tr><tr><td>S\u1ed1 l\u01b0\u1ee3ng \u00f4 t\u00f4 (chi\u1ebfc)<\/td><td>149<\/td><td>116<\/td><td>133<\/td><td>82<\/td><\/tr><\/table> <br\/> <span class='basic_pink'> V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o c\u00e1c \u00f4 tr\u1ed1ng l\u1ea7n l\u01b0\u1ee3t l\u00e0 $149;116;133;82.$<\/span><\/span>"}]}],"id_ques":944},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" M\u1ed1t c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0: ","select":["A. Gi\u00e1 tr\u1ecb l\u1edbn nh\u1ea5t c\u1ee7a d\u1ea5u hi\u1ec7u","B. T\u1ea7n s\u1ed1 l\u1edbn nh\u1ea5t trong b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d","C. Gi\u00e1 tr\u1ecb c\u00f3 t\u1ea7n s\u1ed1 l\u1edbn nh\u1ea5t trong b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d","D. C\u1ea3 3 \u0111\u00e1p \u00e1n tr\u00ean \u0111\u1ec1u sai"],"explain":"<span class='basic_left'>M\u1ed1t c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0 <b>gi\u00e1 tr\u1ecb c\u00f3 t\u1ea7n s\u1ed1 l\u1edbn nh\u1ea5t<\/b> trong b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d; k\u00ed hi\u1ec7u l\u00e0 $M_o$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 C.<\/span><\/span>","column":1}]}],"id_ques":945},{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"\u0110\u1ec1 chung cho hai c\u00e2u","temp":"fill_the_blank","correct":[[["28"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> Cho bi\u1ec3u \u0111\u1ed3 sau v\u1edbi tr\u1ee5c ho\u00e0nh l\u00e0 <b> gi\u00e1 tr\u1ecb $(x)$ <\/b> , tr\u1ee5c tung l\u00e0 <b>t\u1ea7n s\u1ed1 $(n)$<\/b>. <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai22/lv1/img\/D7B22D1_6.png' \/><\/center> <b> C\u00e2u 1. <\/b> L\u1eadp b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d v\u00e0 t\u00ednh s\u1ed1 c\u00e1c gi\u00e1 tr\u1ecb $(N)$ <br\/> <b> \u0110\u00e1p \u00e1n: <\/b> $N=\\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}$ <\/span>","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>L\u1eadp b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d, s\u1ed1 c\u00e1c gi\u00e1 tr\u1ecb $(N)$ b\u1eb1ng t\u1ed5ng c\u00e1c t\u1ea7n s\u1ed1 c\u1ee7a c\u00e1c gi\u00e1 tr\u1ecb. <br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>T\u1eeb bi\u1ec3u \u0111\u1ed3 \u0111\u00e3 cho ta c\u00f3 b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d t\u01b0\u01a1ng \u1ee9ng l\u00e0: <br\/> <table><tr><th>Gi\u00e1 tr\u1ecb $(x)$<\/th><th>6<\/th><th>7<\/th><th>8<\/th><th>9<\/th><th>10<\/th><th><\/th><\/tr><tr><td>T\u1ea7n s\u1ed1 $(n)$<\/td><td>7<\/td><td>6<\/td><td>4<\/td><td>8<\/td><td>3<\/td><td>$N=?$<\/td><\/tr><\/table> <br\/> S\u1ed1 c\u00e1c gi\u00e1 tr\u1ecb $(N)$ l\u00e0: <br\/> $N=7+6+4+8+3=28$ <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $28$.<\/span><\/span>"}]}],"id_ques":946},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"\u0110\u1ec1 chung cho hai c\u00e2u","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":" <span class='basic_left'> Cho bi\u1ec3u \u0111\u1ed3 sau v\u1edbi tr\u1ee5c ho\u00e0nh l\u00e0 <b> gi\u00e1 tr\u1ecb $(x)$ <\/b> , tr\u1ee5c tung l\u00e0 <b>t\u1ea7n s\u1ed1 $(n)$ <\/b>. <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai22/lv1/img\/D7B22D1_6.png' \/><\/center> <b> C\u00e2u 2. <\/b> M\u1ed1t c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0: ","select":["A. $10$","B. $9$","C. $8$","D. $7$"],"explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>M\u1ed1t c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0 <b>gi\u00e1 tr\u1ecb c\u00f3 t\u1ea7n s\u1ed1 l\u1edbn nh\u1ea5t<\/b> trong b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d; k\u00ed hi\u1ec7u l\u00e0 $M_o$<br\/><span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> Theo c\u00e2u 1, ta c\u00f3 b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d: <br\/> <table><tr><th>Gi\u00e1 tr\u1ecb $(x)$<\/th><th>6<\/th><th>7<\/th><th>8<\/th><th>9<\/th><th>10<\/th><th><\/th><\/tr><tr><td>T\u1ea7n s\u1ed1 $(n)$<\/td><td>7<\/td><td>6<\/td><td>4<\/td><td>8<\/td><td>3<\/td><td>$N=28$<\/td><\/tr><\/table> <br\/> Ta th\u1ea5y gi\u00e1 tr\u1ecb $9$ c\u00f3 t\u1ea7n s\u1ed1 l\u1edbn nh\u1ea5t l\u00e0 $8$ <br\/> Do \u0111\u00f3 m\u1ed1t c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0 $9.$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 B.<\/span><\/span>","column":4}]}],"id_ques":947},{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["155,25","155.25"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> Ng\u01b0\u1eddi ta th\u1ed1ng k\u00ea chi\u1ec1u cao t\u00ednh theo centimet c\u1ee7a $8$ h\u1ecdc sinh trong m\u1ed9t l\u1edbp v\u00e0 \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 nh\u01b0 sau: $156; 158; 152; 153; 153; 153; 159; 158$ <br\/> Chi\u1ec1u cao trung b\u00ecnh c\u1ee7a $8$ h\u1ecdc sinh tr\u00ean l\u00e0 _input_ $(cm)$ <br\/> (l\u00e0m tr\u00f2n \u0111\u1ebfn ch\u1eef s\u1ed1 th\u1eadp ph\u00e2n th\u1ee9 hai) <\/span>","hint":"S\u1ed1 trung b\u00ecnh c\u1ed9ng b\u1eb1ng t\u1ed5ng c\u00e1c gi\u00e1 tr\u1ecb chia cho s\u1ed1 gi\u00e1 tr\u1ecb.","explain":"<span class='basic_left'>Chi\u1ec1u cao trung b\u00ecnh c\u1ee7a h\u1ecdc sinh l\u00e0: <br\/> $(156 + 158 + 152 + 153 + 153 + 153 + 159 + 158) : 8 = 155,25\\, (cm)$ <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $155,25$ <\/span><\/span>"}]}],"id_ques":948},{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["12,5","12.5"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> Ng\u01b0\u1eddi ta th\u1ed1ng k\u00ea s\u1ed1 c\u00f4ng nh\u00e2n c\u1ee7a c\u00e1c ph\u00e2n x\u01b0\u1edfng trong m\u1ed9t nh\u00e0 m\u00e1y v\u00e0 \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 theo b\u1ea3ng ''t\u1ea7n s\u1ed1'' nh\u01b0 sau: <br\/> <table><tr><th>S\u1ed1 nh\u00e2n c\u00f4ng $(x)$<\/th><th>10<\/th><th>12<\/th><th>13<\/th><th>14<\/th><th>15<\/th><th><\/th><\/tr><tr><td>T\u1ea7n s\u1ed1 $(n)$<\/td><td>8<\/td><td>3<\/td><td>5<\/td><td>6<\/td><td>4<\/td><td>$N=26$<\/td><\/tr><\/table><br\/> S\u1ed1 trung b\u00ecnh c\u1ed9ng c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0 _input_ <\/span>","explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>C\u00f4ng th\u1ee9c t\u00ednh trung b\u00ecnh c\u1ed9ng: <br\/> $\\overline{X}=\\dfrac{{{x}_{1}}{{n}_{1}}+{{x}_{2}}{{n}_{2}}+{{x}_{3}}{{n}_{3}}+.....+{{x}_{k}}{{n}_{k}}}{N}$ <br\/> Trong \u0111\u00f3: <br\/> ${{x}_{1}};{{x}_{2}};...;{{x}_{k}}$ l\u00e0 $k$ gi\u00e1 tr\u1ecb kh\u00e1c nhau c\u1ee7a d\u1ea5u hi\u1ec7u $X$ <br\/> $n_1;{{n}_{2}};...;{{n}_{k}}$ l\u00e0 $k$ t\u1ea7n s\u1ed1 t\u01b0\u01a1ng \u1ee9ng <br\/> $N$ l\u00e0 s\u1ed1 c\u00e1c gi\u00e1 tr\u1ecb <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/> S\u1ed1 trung b\u00ecnh c\u1ed9ng c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0: <br\/> $\\overline{X}=\\dfrac{10.8+12.3+13.5+14.6+15.4}{26}=12,5$ <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $12,5$ <\/span><\/span>"}]}],"id_ques":949},{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"\u0110\u1ec1 chung cho hai c\u00e2u","temp":"fill_the_blank","correct":[[["11"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> Ng\u01b0\u1eddi ta th\u1ed1ng k\u00ea s\u1ed1 chim b\u1ed3 c\u00e2u c\u1ee7a c\u00e1c chu\u1ed3ng trong m\u1ed9t trang tr\u1ea1i ch\u0103n nu\u00f4i v\u00e0 \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 theo b\u1ea3ng ''t\u1ea7n s\u1ed1'' nh\u01b0 sau: <br\/> <table><tr><th>S\u1ed1 chim b\u1ed3 c\u00e2u $(x)$<\/th><th>7<\/th><th>8<\/th><th>9<\/th><th>10<\/th><th>11<\/th><th><\/th><\/tr><tr><td>T\u1ea7n s\u1ed1 $(n)$<\/td><td>3<\/td><td>6<\/td><td>5<\/td><td>3<\/td><td>8<\/td><td>$N=25$<\/td><\/tr><\/table><br\/> <b> C\u00e2u 1. <\/b> M\u1ed1t c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0 _input_ <\/span>","explain":"<span class='basic_left'>Nh\u00ecn v\u00e0o b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d \u0111\u1ec1 b\u00e0i \u0111\u00e3 cho, ta th\u1ea5y: Gi\u00e1 tr\u1ecb $11$ c\u00f3 t\u1ea7n s\u1ed1 l\u1edbn nh\u1ea5t l\u00e0 $8$. <br\/> Do \u0111\u00f3 m\u1ed1t c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0 $11$ <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $11$ <\/span><\/span>"}]}],"id_ques":950},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"\u0110\u1ec1 chung cho hai c\u00e2u","temp":"multiple_choice","correct":[[4]],"list":[{"point":5,"ques":" <span class='basic_left'> Ng\u01b0\u1eddi ta th\u1ed1ng k\u00ea s\u1ed1 chim b\u1ed3 c\u00e2u c\u1ee7a c\u00e1c chu\u1ed3ng trong m\u1ed9t trang tr\u1ea1i ch\u0103n nu\u00f4i v\u00e0 \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 theo b\u1ea3ng ''t\u1ea7n s\u1ed1'' nh\u01b0 sau: <br\/> <table><tr><th>S\u1ed1 chim b\u1ed3 c\u00e2u $(x)$<\/th><th>7<\/th><th>8<\/th><th>9<\/th><th>10<\/th><th>11<\/th><th><\/th><\/tr><tr><td>T\u1ea7n s\u1ed1 $(n)$<\/td><td>3<\/td><td>6<\/td><td>5<\/td><td>3<\/td><td>8<\/td><td>$N=25$<\/td><\/tr><\/table><br\/> <b> C\u00e2u 2. <\/b> S\u1ed1 trung b\u00ecnh c\u1ed9ng c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0: ","select":["A. $8,25$","B. $8,7$","C. $9$","D. $9,28$"],"explain":"<span class='basic_left'>S\u1ed1 trung b\u00ecnh c\u1ed9ng c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0: <br\/>$\\overline{X}=\\dfrac{7.3+8.6+9.5+10.3+11.8}{25}=\\dfrac{232}{25}=9,28$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 D.<\/span><\/span>","column":4}]}],"id_ques":951},{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["8,69","8.69"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" K\u1ebft qu\u1ea3 b\u1eafn $100$ ph\u00e1t s\u00fang c\u1ee7a m\u1ed9t x\u1ea1 th\u1ee7 \u0111\u01b0\u1ee3c ghi trong b\u1ea3ng sau:<br\/> <table><tr><th>\u0110i\u1ec3m s\u1ed1<\/th><th>10<\/th><th>9<\/th><th>8<\/th><th>7<\/th><th>6<\/th><th><\/th><\/tr><tr><td>T\u1ea7n s\u1ed1<\/td><td>25<\/td><td>42<\/td><td>14<\/td><td>15<\/td><td>4<\/td><td>$N=100$<\/td><\/tr><\/table> <br\/> T\u00ednh \u0111i\u1ec3m trung b\u00ecnh c\u1ee7a m\u1ed7i l\u1ea7n b\u1eafn. <br\/> <b> \u0110\u00e1p \u00e1n: <\/b> $ \\FormInput[40][bl_elm_true basic_elm basic_blank basic_blank_part]{}$ <br\/> (l\u00e0m tr\u00f2n \u0111\u1ebfn ch\u1eef s\u1ed1 th\u1eadp ph\u00e2n th\u1ee9 hai) <\/span>","explain":"<span class='basic_left'>\u0110i\u1ec3m trung b\u00ecnh c\u1ee7a m\u1ed7i l\u1ea7n b\u1eafn l\u00e0: <br\/> $\\overline{X}=\\dfrac{10.25+9.42+8.14+7.15+6.4}{100}=\\dfrac{869}{100}=8,69$ <br\/> <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $8,69$<\/span><\/span>"}]}],"id_ques":952},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"\u0110\u1ec1 chung cho hai c\u00e2u","temp":"multiple_choice","correct":[[3]],"list":[{"point":5,"ques":" <span class='basic_left'> T\u1ea7n s\u1ed1 v\u00e0 c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a m\u1ed9t d\u1ea5u hi\u1ec7u \u0111\u01b0\u1ee3c ghi trong b\u1ea3ng sau: <br\/> <table><tr><th>Gi\u00e1 tr\u1ecb $(x)$<\/th><th>10<\/th><th>9<\/th><th>8<\/th><th>7<\/th><th>6<\/th><th><\/th><\/tr><tr><td>T\u1ea7n s\u1ed1 $(n)$<\/td><td>6<\/td><td>7<\/td><td>y<\/td><td>9<\/td><td>5<\/td><td>$N=40$<\/td><\/tr><\/table><br\/> <b> C\u00e2u 1. <\/b> T\u00ednh $y$. ","select":["A. $y=11$","B. $y=12$","C. $y=13$","D. $y=14$"],"hint":"T\u00ednh $y$ th\u00f4ng qua s\u1ed1 c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a d\u1ea5u hi\u1ec7u $(N)$.","explain":"<span class='basic_left'>Ta c\u00f3: <br\/> $\\begin{align}& 5+9+y+7+6=40 \\\\ & \\Rightarrow 27+y=40 \\\\ & \\Rightarrow y=40-27 \\\\ & \\Rightarrow y=13 \\\\ \\end{align}$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 C.<\/span><\/span>","column":4}]}],"id_ques":953},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"\u0110\u1ec1 chung cho hai c\u00e2u","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":" <span class='basic_left'> T\u1ea7n s\u1ed1 v\u00e0 c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a m\u1ed9t d\u1ea5u hi\u1ec7u \u0111\u01b0\u1ee3c ghi trong b\u1ea3ng sau: <br\/> <table><tr><th>Gi\u00e1 tr\u1ecb $(x)$<\/th><th>10<\/th><th>9<\/th><th>8<\/th><th>7<\/th><th>6<\/th><th><\/th><\/tr><tr><td>T\u1ea7n s\u1ed1 $(n)$<\/td><td>6<\/td><td>7<\/td><td>y<\/td><td>9<\/td><td>5<\/td><td>$N=40$<\/td><\/tr><\/table><br\/> <b> C\u00e2u 2. <\/b> T\u00ecm s\u1ed1 trung b\u00ecnh c\u1ed9ng c\u1ee7a d\u1ea5u hi\u1ec7u. ","select":["A. $7$","B. $8$","C. $9$","D. $10$"],"explain":"<span class='basic_left'> Theo c\u00e2u 1, ta c\u00f3: $y=13$ <br\/> S\u1ed1 trung b\u00ecnh c\u1ed9ng c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0: <br\/> $\\overline{X}=\\dfrac{6.5+7.9+8.13+9.7+10.6}{40}=\\dfrac{320}{40}=8$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 B.<\/span><\/span>","column":4}]}],"id_ques":954},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":" <span class='basic_left'> Cho b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d sau: <br\/> <table><tr><th>Gi\u00e1 tr\u1ecb $(x)$<\/th><th>3<\/th><th>5<\/th><th>8<\/th><th>9<\/th><th><\/th><\/tr><tr><td>T\u1ea7n s\u1ed1 $(n)$<\/td><td>6<\/td><td>4<\/td><td>3<\/td><td>5<\/td><td>$N=18$<\/td><\/tr><\/table><br\/> Cho bi\u1ebft bi\u1ec3u \u0111\u1ed3 n\u00e0o sau \u0111\u00e2y v\u1ebd \u0111\u00fang theo s\u1ed1 li\u1ec7u b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d tr\u00ean?","select":["A. <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai22/lv1/img\/D7B22D1_12a.png' \/><\/center>","B. <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai22/lv1/img\/D7B22D1_12b.png' \/><\/center>"],"explain":"<span class='basic_left'>H\u00ecnh A bi\u1ec3u di\u1ec5n \u0111\u00fang theo b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d \u0111\u00e3 cho. <br\/> H\u00ecnh B bi\u1ec3u di\u1ec5n sai v\u00ec gi\u00e1 tr\u1ecb $3$ c\u00f3 t\u1ea7n s\u1ed1 l\u00e0 $6$ ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 $4$; Gi\u00e1 tr\u1ecb $5$ c\u00f3 t\u1ea7n s\u1ed1 l\u00e0 $4$ ch\u1ee9 kh\u00f4ng ph\u1ea3i l\u00e0 $6$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A.<\/span><\/span>","column":2}]}],"id_ques":955},{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"\u0110\u1ec1 chung cho hai c\u00e2u","temp":"fill_the_blank","correct":[[["2"],["6"],["10"],["12"],["20"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'>K\u1ebft qu\u1ea3 b\u1eafn 50 ph\u00e1t \u0111\u1ea1n c\u1ee7a m\u1ed9t x\u1ea1 th\u1ee7 \u0111\u01b0\u1ee3c ghi l\u1ea1i nh\u01b0 sau: <br\/> C\u00f3 $20$ ph\u00e1t \u0111\u1ea1n \u0111i\u1ec3m $10$ <br\/> C\u00f3 $12$ ph\u00e1t \u0111\u1ea1n \u0111i\u1ec3m $9$ <br\/> C\u00f3 $10$ ph\u00e1t \u0111\u1ea1n \u0111i\u1ec3m $8$ <br\/> C\u00f3 $6$ ph\u00e1t \u0111\u1ea1n \u0111i\u1ec3m $7$ <br\/> C\u00f3 $2$ ph\u00e1t \u0111\u1ea1n \u0111i\u1ec3m $6$ <br\/> <b> C\u00e2u 1. <\/b> \u0110i\u1ec1n v\u00e0o c\u00e1c \u00f4 tr\u1ed1ng trong b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d sau: <br\/> <table><tr><th>S\u1ed1 \u0111i\u1ec3m $(x)$<\/th><th>6<\/th><th>7<\/th><th>8<\/th><th>9<\/th><th>10<\/th><th><\/th><\/tr><tr><td>T\u1ea7n s\u1ed1 $(n)$<\/td><td>_input_ <\/td><td>_input_<\/td><td>_input_<\/td><td>_input_<\/td><td>_input_<\/td><td>$N=50$<\/td><\/tr><\/table> <\/span>","explain":"<span class='basic_left'>Ta c\u00f3 b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d ho\u00e0n ch\u1ec9nh nh\u01b0 sau: <br\/><table><tr><th>S\u1ed1 \u0111i\u1ec3m $(x)$<\/th><th>6<\/th><th>7<\/th><th>8<\/th><th>9<\/th><th>10<\/th><th><\/th><\/tr><tr><td>T\u1ea7n s\u1ed1 $(n)$<\/td><td>2<\/td><td>6<\/td><td>10<\/td><td>12<\/td><td>20<\/td><td>$N=50$<\/td><\/tr><\/table> <br\/> <span class='basic_pink'> V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o c\u00e1c \u00f4 tr\u1ed1ng l\u1ea7n l\u01b0\u1ee3t l\u00e0 $2;6;10;12;20$<\/span><\/span>"}]}],"id_ques":956},{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"\u0110\u1ec1 chung cho hai c\u00e2u","temp":"fill_the_blank","correct":[[["8,84","8.84"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'>K\u1ebft qu\u1ea3 b\u1eafn 50 ph\u00e1t \u0111\u1ea1n c\u1ee7a m\u1ed9t x\u1ea1 th\u1ee7 \u0111\u01b0\u1ee3c ghi l\u1ea1i nh\u01b0 sau: <br\/> C\u00f3 $20$ ph\u00e1t \u0111\u1ea1n \u0111i\u1ec3m $10$ <br\/> C\u00f3 $12$ ph\u00e1t \u0111\u1ea1n \u0111i\u1ec3m $9$ <br\/> C\u00f3 $10$ ph\u00e1t \u0111\u1ea1n \u0111i\u1ec3m $8$ <br\/> C\u00f3 $6$ ph\u00e1t \u0111\u1ea1n \u0111i\u1ec3m $7$ <br\/> C\u00f3 $2$ ph\u00e1t \u0111\u1ea1n \u0111i\u1ec3m $6$ <br\/> <b> C\u00e2u 2. <\/b> T\u00ednh s\u1ed1 trung b\u00ecnh c\u1ed9ng c\u1ee7a d\u1ea5u hi\u1ec7u. <br\/> <b> \u0110\u00e1p \u00e1n: <\/b> _input_ <br\/> (l\u00e0m tr\u00f2n \u0111\u1ebfn ch\u1eef s\u1ed1 th\u1eadp ph\u00e2n th\u1ee9 hai) <\/span>","explain":"<span class='basic_left'>S\u1ed1 trung b\u00ecnh c\u1ed9ng c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0: <br\/> $\\overline{X}=\\dfrac{6.2+7.6+8.10+9.12+10.20}{50}=\\dfrac{442}{50}=8,84$ <br\/> <span class='basic_pink'> V\u1eady s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o \u00f4 tr\u1ed1ng l\u00e0 $8,84$<\/span><\/span>"}]}],"id_ques":957},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[2]],"list":[{"point":5,"ques":"<span class='basic_left'>D\u00e2n s\u1ed1 Vi\u1ec7t Nam qua c\u00e1c \u0111\u1ee3t t\u1ed5ng \u0111i\u1ec1u tra \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng bi\u1ec3u \u0111\u1ed3 sau (\u0111\u01a1n v\u1ecb \u1edf c\u00e1c c\u1ed9t l\u00e0 tri\u1ec7u ng\u01b0\u1eddi): <center><img src='https://www.luyenthi123.com/file/luyenthi123/lop7/toan/daiso/bai22/lv1/img\/D7B22D1_14.png' \/><\/center> T\u1eeb bi\u1ec3u \u0111\u1ed3 n\u00e0y, m\u1ed9t b\u1ea1n h\u1ecdc sinh l\u1eadp ra b\u1ea3ng sau (b\u1ea3ng 1): <br\/> <table><tr><th>N\u0103m<\/th><th>1921<\/th><th>1960<\/th><th>1980<\/th><th>1990<\/th><th>2000<\/th><\/tr><tr><td>S\u1ed1 d\u00e2n (tri\u1ec7u ng\u01b0\u1eddi)<\/td><td>16<\/td><td>30<\/td><td>50<\/td><td>66<\/td><td>76<\/td><\/tr><\/table> <br\/> H\u00e3y ch\u1ecdn kh\u1eb3ng \u0111\u1ecbnh \u0111\u00fang trong c\u00e1c kh\u1eb3ng \u0111\u1ecbnh sau. <\/span>","select":["A. B\u1ea3ng $1$ sai m\u1ed9t c\u1ed9t","B. B\u1ea3ng $1$ sai hai c\u1ed9t","C. B\u1ea3ng $1$ sai ba c\u1ed9t ","D. B\u1ea3ng $1$ \u0111\u00fang ho\u00e0n to\u00e0n "],"explain":"<span class='basic_left'>B\u1ea3ng $1$ c\u00f3 hai c\u1ed9t sai: <br\/> - C\u1ed9t n\u0103m $1980$ ph\u1ea3i l\u00e0 $54$ tri\u1ec7u ng\u01b0\u1eddi <br\/> - C\u1ed9t n\u0103m $2000$ l\u00e0 sai, ph\u1ea3i l\u00e0 n\u0103m $1999$ m\u1edbi \u0111\u00fang. <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 B.<\/span><\/span>","column":2}]}],"id_ques":958},{"time":24,"part":[{"title":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","title_trans":"","temp":"fill_the_blank","correct":[[["7,3","7.3"],["6,4","6.4"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'>\u0110\u1ec3 \u0111\u00e1nh gi\u00e1 ch\u1ea5t l\u01b0\u1ee3ng h\u1ecdc To\u00e1n c\u1ee7a hai l\u1edbp $7A$ v\u00e0 $7B$, m\u1ed7i l\u1edbp ch\u1ecdn ng\u1eabu nhi\u00ean $10$ h\u1ecdc sinh \u0111\u1ec3 l\u00e0m b\u00e0i ki\u1ec3m tra, \u0111i\u1ec3m s\u1ed1 nh\u01b0 sau: <br\/> L\u1edbp $7A: \\,4;5;5;6;7;7;9;10;10;10$ <br\/> L\u1edbp $7B:\\, 4;4;5;5;5;7;8;8;9;9$ <br\/> T\u00ednh \u0111i\u1ec3m trung b\u00ecnh c\u1ee7a m\u1ed7i l\u1edbp. <br\/> <b> \u0110\u00e1p \u00e1n: <\/b> \u0110i\u1ec3m trung b\u00ecnh c\u1ee7a l\u1edbp $7A$ l\u00e0 _input_ <br\/> \u0110i\u1ec3m trung b\u00ecnh c\u1ee7a l\u1edbp $7B$ l\u00e0 _input_ <br\/> (l\u00e0m tr\u00f2n \u0111\u1ebfn ch\u1eef s\u1ed1 th\u1eadp ph\u00e2n th\u1ee9 nh\u1ea5t) <\/span>","explain":"<span class='basic_left'>\u0110i\u1ec3m trung b\u00ecnh c\u1ee7a l\u1edbp $7A$ l\u00e0: <br\/> $\\dfrac{4+5+5+6+7+7+9+10+10+10}{10}=\\dfrac{73}{10}=7,3$ <br\/> \u0110i\u1ec3m trung b\u00ecnh c\u1ee7a l\u1edbp $7B$ l\u00e0: <br\/> $\\dfrac{4+4+5+5+5+7+8+8+9+9}{10}=\\dfrac{64}{10}=6,4$ <br\/> <span class='basic_pink'> V\u1eady c\u00e1c s\u1ed1 c\u1ea7n \u0111i\u1ec1n v\u00e0o c\u00e1c \u00f4 tr\u1ed1ng l\u1ea7n l\u01b0\u1ee3t l\u00e0 $7,3$ v\u00e0 $6,4$<\/span><\/span>"}]}],"id_ques":959},{"time":24,"part":[{"title":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","title_trans":"","temp":"multiple_choice","correct":[[1]],"list":[{"point":5,"ques":"<span class='basic_left'>Trong m\u1ed9t c\u00f4ng x\u01b0\u1edfng, th\u1ed1ng k\u00ea tu\u1ed5i c\u1ee7a $20$ nh\u00e2n vi\u00ean \u1edf hai t\u1ed5 $1$ v\u00e0 $2$ \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 sau: <br\/> T\u1ed5 $1:\\, 22;30;32;38;43;52;32;30;43;50$ <br\/> T\u1ed5 $2:\\, 24;26;28;28;28;30;30;32;47;47$ <br\/> Kh\u1eb3ng \u0111\u1ecbnh n\u00e0o sau \u0111\u00e2y \u0111\u00fang:<\/span>","select":["A. Tu\u1ed5i trung b\u00ecnh c\u1ee7a t\u1ed5 1 l\u1edbn h\u01a1n tu\u1ed5i trung b\u00ecnh c\u1ee7a t\u1ed5 2.","B. Tu\u1ed5i trung b\u00ecnh c\u1ee7a t\u1ed5 1 nh\u1ecf h\u01a1n tu\u1ed5i trung b\u00ecnh c\u1ee7a t\u1ed5 2.","C. Tu\u1ed5i trung b\u00ecnh c\u1ee7a t\u1ed5 1 b\u1eb1ng tu\u1ed5i trung b\u00ecnh c\u1ee7a t\u1ed5 2."],"explain":"<span class='basic_left'><span class='basic_green'>H\u01b0\u1edbng d\u1eabn:<\/span><br\/>T\u00ednh tu\u1ed5i trung b\u00ecnh c\u1ee7a m\u1ed7i t\u1ed5 r\u1ed3i so s\u00e1nh s\u1ed1 tu\u1ed5i trung b\u00ecnh \u0111\u00f3. <br\/> <span class='basic_green'>B\u00e0i gi\u1ea3i:<\/span><br\/>X\u00e9t $20$ nh\u00e2n vi\u00ean \u1edf c\u1ea3 hai t\u1ed5 $1$ v\u00e0 $2$ n\u00ean m\u1ed7i t\u1ed5 c\u00f3 $10$ ng\u01b0\u1eddi. <br\/> S\u1ed1 tu\u1ed5i trung b\u00ecnh c\u1ee7a t\u1ed5 $1$ l\u00e0: <br\/> $\\dfrac{22+30+32+38+43+52+32+30+43+50}{10}=\\dfrac{372}{10}=37,2$ <br\/> S\u1ed1 tu\u1ed5i trung b\u00ecnh c\u1ee7a t\u1ed5 $2$ l\u00e0: <br\/> $\\dfrac{24+26+28+28+28+30+30+32+47+47}{10}=\\dfrac{320}{10}=32$ <br\/> Do \u0111\u00f3, tu\u1ed5i trung b\u00ecnh c\u1ee7a t\u1ed5 $1$ l\u1edbn h\u01a1n tu\u1ed5i trung b\u00ecnh c\u1ee7a t\u1ed5 $2.$ <br\/> <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A.<\/span><\/span>","column":1}]}],"id_ques":960}],"lesson":{"save":0,"level":1}}