Các số đặc trưng đo xu thế trung tâm

Home Lớp 11 Toán lớp 11 - Sách kết nối tri thức Bài 9 - Các số đặc trưng đo xu thế trung tâm.Bài tập nâng cao

{"common":{"save":0,"post_id":"7062","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"5017","post_id":"7062","mon_id":"1158924","chapter_id":"1159152","question":"Cho m\u1eabu s\u1ed1 li\u1ec7u ghép nhóm v\u1ec1 th\u1ed1ng kê th\u1eddi gian hoàn thành (phút) c\u1ee7a m\u1ed9t bài ki\u1ec3m tra tr\u1ef1c tuy\u1ebfn c\u1ee7a 100 h\u1ecdc sinh, ta có b\u1ea3ng s\u1ed1 li\u1ec7u sau.<\/p><svg height=\"100\" width=\"440\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\"> <g><title><\/title><rect fill=\"#fff\" height=\"102\" id=\"canvas_background\" width=\"442\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" height=\"100%\" id=\"canvasGrid\" overflow=\"visible\" width=\"100%\" x=\"0\" y=\"0\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g><title><\/title><image height=\"87\" id=\"svg_1\" stroke=\"null\" width=\"441.00003\" x=\"0\" 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y=\"5.5\"><\/image> <\/g> <\/svg><\/span><\/p>Th\u1eddi gian trung bình \u0111\u1ec3 100 h\u1ecdc sinh hoàn thành bài ki\u1ec3m tra là<\/p>","options":["A.<\/strong> 38,92 phút","B.<\/strong> 38,29 phút","C.<\/strong> 39,28 phút","D.<\/strong> 39,82 phút"],"correct":"1","level":"3","hint":"","answer":"Th\u1eddi gian trung bình \u0111\u1ec3 100 h\u1ecdc sinh hoàn thành bài ki\u1ec3m tra là<\/p>$\\overline{x}=\\dfrac{4.34+13.36+38.38+27.40+14.42+4.44}{100}=38,92$<\/span> phút.<\/p>Ch\u1ecdn     A.<\/strong> 38,92 phút.<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-12-21 01:46:31","option_type":"txt","len":2},{"id":"5019","post_id":"7062","mon_id":"1158924","chapter_id":"1159152","question":"Cho m\u1eabu s\u1ed1 li\u1ec7u ghép nhóm v\u1ec1 th\u1ed1ng kê chi\u1ec1u cao (mét) c\u1ee7a 35 cây b\u1ea1ch \u0111àn trong r\u1eebng, ta có b\u1ea3ng s\u1ed1 li\u1ec7u th\u1ed1ng kê sau.<\/p><svg height=\"100\" width=\"410\" 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\" y=\"1\"><\/image> <\/g> <\/svg><\/span><\/p>Chièu cao trung bình (mét) c\u1ee7a 35 cây b\u1ea1ch \u0111àn trên (k\u1ebft qu\u1ea3 làm tròn \u0111\u1ebfn hàng ph\u1ea7n nghìn) là<\/p>","options":["A.<\/strong> 7,478 mét","B.<\/strong> 7,479 mét","C.<\/strong> 7,477 mét ","D.<\/strong> 7,476 mét"],"correct":"2","level":"3","hint":"","answer":"Chi\u1ec1u cao trung bình c\u1ee7a 35 cây b\u1ea1ch \u0111àn là<\/p>$\\overline{x}=\\dfrac{6.6,75+13.7,25+10.7,75+6.8,25}{35} \\approx 7,479$<\/span>  mét.<\/p>Ch\u1ecdn   B.<\/strong> 7,479 mét.<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-12-21 02:06:38","option_type":"txt","len":2},{"id":"5021","post_id":"7062","mon_id":"1158924","chapter_id":"1159152","question":"Cho m\u1eabu s\u1ed1 li\u1ec7u ghép nhóm v\u1ec1 th\u1ed1ng kê nhi\u1ec7t \u0111\u1ed9 t\u1ea1i m\u1ed9t \u0111\u1ecba \u0111i\u1ec3m trong 30 ngày, ta có b\u1ea3ng s\u1ed1 li\u1ec7u sau.<\/p><svg height=\"100\" width=\"420\" 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\" y=\"0\"><\/image> <\/g> <\/svg><\/span><\/p>M\u1ed1t c\u1ee7a m\u1eabu s\u1ed1 li\u1ec7u ghép nhóm<\/p>","options":["A.<\/strong> 22,58 °C","B.<\/strong> 22,59 °C","C.<\/strong> 22,57 °C","D.<\/strong> 22,60 °C"],"correct":"1","level":"3","hint":"","answer":"Nhóm 2 \u1ee9ng v\u1edbi n\u1eeda kho\u1ea3ng [21;24) có t\u1ea7n s\u1ed1 l\u1edbn nh\u1ea5t v\u1edbi $a_2=21$<\/span>, $h=3$<\/span>, $m_2-m_1=15-5=10$<\/span>, $m_2-m_3=15-6=9$<\/span> .<\/p>M\u1ed1t là $M_o=a_2+\\dfrac{m_2-m_1}{(m_2-m_1)+(m_2-m_3)}.h=21+\\dfrac{10}{10+9}.3 \\approx 22,58^0 C$<\/span> <\/p>Ch\u1ecdn    A.<\/strong> 22,58 °C.<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2023-12-21 02:27:21","option_type":"txt","len":1}]}