{"common":{"save":0,"post_id":"1391","level":2,"total":20,"point":5,"point_extra":0},"segment":[{"id":"1011","post_id":"1391","mon_id":"0","chapter_id":"0","question":"\u0110i\u1ec1n k\u1ebft qu\u1ea3 \u0111\u00fang nh\u1ea5t v\u00e0o \u00f4 tr\u1ed1ng","options":{"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"],["1"],["5"],["3"],["5"],["3"],["1"]]],"list":[{"point":5,"width":40,"content":"","type_input":"","ques":" <span class='basic_left'> Ng\u01b0\u1eddi ta th\u1ed1ng k\u00ea s\u1ed1 h\u1ecdc sinh c\u1ee7a $20$ l\u1edbp h\u1ecdc trong m\u1ed9t tr\u01b0\u1eddng trung h\u1ecdc c\u01a1 s\u1edf v\u00e0 thu \u0111\u01b0\u1ee3c b\u1ea3ng k\u1ebft qu\u1ea3 sau: <br\/> <table><tr><th>34<\/th><th>30<\/th><th>34<\/th><th>33<\/th><th>30<\/th><th>32<\/th><th>34<\/th><th>35<\/th><th>34<\/th><th>35<\/th><\/tr><tr><td>34<\/td><td>33<\/td><td>32<\/td><td>32<\/td><td>32<\/td><td>35<\/td><td>31<\/td><td>32<\/td><td>33<\/td><td>36<\/td><\/tr><\/table> <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 h\u1ecdc sinh $(x)$<\/th><th>30<\/th><th>31<\/th><th>32<\/th><th>33<\/th><th>34<\/th><th>35<\/th><th>36<\/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>_input_<\/td><td>_input_<\/td><\/tr><\/table> <\/span>","explain":"<span class='basic_left'> T\u1eeb b\u1ea3ng s\u1ed1 li\u1ec7u ban \u0111\u1ea7u \u0111\u00e3 cho ta c\u00f3 b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d t\u01b0\u01a1ng \u1ee9ng l\u00e0: <br\/> <table><tr><th>S\u1ed1 h\u1ecdc sinh $(x)$<\/th><th>30<\/th><th>31<\/th><th>32<\/th><th>33<\/th><th>34<\/th><th>35<\/th><th>36<\/th><\/tr><tr><td>T\u1ea7n s\u1ed1 $(n)$<\/td><td>2<\/td><td>1<\/td><td>5<\/td><td>3<\/td><td>5<\/td><td>3<\/td><td>1<\/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 $2;1;5;3;5;3;1.$<\/span><\/span>"}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:54"},{"id":"1012","post_id":"1391","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"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'>Ng\u01b0\u1eddi ta th\u1ed1ng k\u00ea s\u1ed1 h\u1ecdc sinh c\u1ee7a $20$ l\u1edbp h\u1ecdc trong m\u1ed9t tr\u01b0\u1eddng trung h\u1ecdc c\u01a1 s\u1edf v\u00e0 thu \u0111\u01b0\u1ee3c b\u1ea3ng k\u1ebft qu\u1ea3 sau: <br\/> <table><tr><th>34<\/th><th>30<\/th><th>34<\/th><th>33<\/th><th>30<\/th><th>32<\/th><th>34<\/th><th>35<\/th><th>34<\/th><th>35<\/th><\/tr><tr><td>34<\/td><td>33<\/td><td>32<\/td><td>32<\/td><td>32<\/td><td>35<\/td><td>31<\/td><td>32<\/td><td>33<\/td><td>36<\/td><\/tr><\/table> <br\/> <b>C\u00e2u 2.<\/b> M\u1ed1t c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0 32. <\/span>","select":["\u0110\u00fang","Sai"],"explain":"<span class='basic_left'> Theo c\u00e2u 1, ta c\u00f3 b\u1ea3ng ''t\u1ea7n s\u1ed1'' nh\u01b0 sau: <br\/><table><tr><th>S\u1ed1 h\u1ecdc sinh $(x)$<\/th><th>30<\/th><th>31<\/th><th>32<\/th><th>33<\/th><th>34<\/th><th>35<\/th><th>36<\/th><\/tr><tr><td>T\u1ea7n s\u1ed1 $(n)$<\/td><td>2<\/td><td>1<\/td><td>5<\/td><td>3<\/td><td>5<\/td><td>3<\/td><td>1<\/td><\/tr><\/table> <br\/> Nh\u00ecn v\u00e0o b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d ta th\u1ea5y hai gi\u00e1 tr\u1ecb $32$ v\u00e0 $34$ \u0111\u1ec1u c\u00f3 t\u1ea7n s\u1ed1 l\u1edbn nh\u1ea5t l\u00e0 $5.$ <br\/> Do \u0111\u00f3, m\u1ed1t c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0 $32$ v\u00e0 $34.$<br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 Sai.<\/span> <br\/> <b>L\u01b0u \u00fd:<\/b> M\u1ed1t c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0 gi\u00e1 tr\u1ecb c\u00f3 t\u1ea7n s\u1ed1 l\u1edbn nh\u1ea5t. <br\/> M\u1ed9t d\u1ea5u hi\u1ec7u c\u00f3 th\u1ec3 c\u00f3 nhi\u1ec1u m\u1ed1t. <\/span>","column":2}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:54"},{"id":"1013","post_id":"1391","mon_id":"0","chapter_id":"0","question":"L\u1ef1a ch\u1ecdn \u0111\u00e1p \u00e1n \u0111\u00fang nh\u1ea5t","options":{"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":[[1]],"list":[{"point":5,"ques":" <span class='basic_left'>Cho d\u00e3y gi\u00e1 tr\u1ecb trong b\u1ea3ng sau: <br\/> <table><tr><th>17<\/th><th>20<\/th><th>18<\/th><th>18<\/th><th>19<\/th><th>17<\/th><th>22<\/th><th>30<\/th><th>18<\/th><th>21<\/th><\/tr><tr><td>17<\/td><td>32<\/td><td>19<\/td><td>20<\/td><td>26<\/td><td>18<\/td><td>21<\/td><td>24<\/td><td>19<\/td><td>21<\/td><\/tr><tr><td>28<\/td><td>18<\/td><td>19<\/td><td>31<\/td><td>26<\/td><td>26<\/td><td>31<\/td><td>24<\/td><td>24<\/td><td>22<\/td><\/tr><\/table> <br\/> <b>C\u00e2u 1.<\/b> L\u1eadp b\u1ea3ng \u201ct\u1ea7n s\u1ed1\u201d v\u00e0 t\u00ednh s\u1ed1 trung b\u00ecnh c\u1ed9ng c\u1ee7a d\u1ea5u hi\u1ec7u. <br\/> S\u1ed1 trung b\u00ecnh c\u1ed9ng c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0: <\/span>","select":["A. $22,2$","B. $25$","C. $26,43$","D. $28$"],"explain":"<span class='basic_left'> 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>T\u1ea7n s\u1ed1 $(n)$<\/th><th>C\u00e1c t\u00edch $(x.n)$<\/th><\/tr><tr><td>17<\/td><td>3<\/td><td>51<\/td><\/tr><tr><td>18<\/td><td>5<\/td><td>90<\/td><\/tr><tr><td>19<\/td><td>4<\/td><td>76<\/td><\/tr><tr><td>20<\/td><td>2<\/td><td>40<\/td><\/tr><tr><td>21<\/td><td>3<\/td><td>63<\/td><\/tr><tr><td>22<\/td><td>2<\/td><td>44<\/td><\/tr><tr><td>24<\/td><td>3<\/td><td>72<\/td><\/tr><tr><td>26<\/td><td>3<\/td><td>78<\/td><\/tr><tr><td>28<\/td><td>1<\/td><td>28<\/td><\/tr><tr><td>30<\/td><td>1<\/td><td>30<\/td><\/tr><tr><td>31<\/td><td>2<\/td><td>62<\/td><\/tr><tr><td>32<\/td><td>1<\/td><td>32<\/td><\/tr><tr><td><\/td><td>$N=30$<\/td><td>T\u1ed5ng: $666$<\/td><\/tr><\/table> <br\/> S\u1ed1 trung b\u00ecnh c\u1ed9ng c\u1ee7a d\u1ea5u hi\u1ec7u l\u00e0: <br\/> $\\overline{X}=\\dfrac{666}{30}=22,2$ <br\/><span class='basic_pink'> V\u1eady \u0111\u00e1p \u00e1n l\u00e0 A.<\/span> <\/span>","column":4}]}]},"correct":"","level":"2","hint":"","answer":"","type":"json","extra_type":"","time":"0","user_id":"0","test":"0","date":"2019-09-30 09:22:54"}]}