Bài tập cuối chương 7 - Tần số và tần số tương đối (dễ)

Home Lớp 9 Toán lớp 9 - Sách Kết nối tri thức Bài tập cuối chương 7 - Tần số và tần số tương đốiBài tập cơ bản

{"common":{"save":0,"post_id":"7963","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"10397","post_id":"7963","mon_id":"1159278","chapter_id":"1159331","question":"Ch\u1ecdn \u0111áp án \u0111úng.<\/strong><\/p>","options":["A. <\/strong>Trong b\u1ea3ng t\u1ea7n s\u1ed1, ta ch\u1ec9 li\u1ec7t kê các giá tr\u1ecb khác nhau. Các giá tr\u1ecb này có th\u1ec3 không là s\u1ed1.","B.<\/strong> Trong b\u1ea3ng t\u1ea7n s\u1ed1, ta ch\u1ec9 li\u1ec7t kê các giá tr\u1ecb khác nhau. Các giá tr\u1ecb này ph\u1ea3i là s\u1ed1.","C.<\/strong> Trong b\u1ea3ng t\u1ea7n s\u1ed1, ta có th\u1ec3 li\u1ec7t kê các giá tr\u1ecb gi\u1ed1ng nhau. Các giá tr\u1ecb này có th\u1ec3 không là s\u1ed1.","D.<\/strong> Trong b\u1ea3ng t\u1ea7n s\u1ed1, ta có th\u1ec3 li\u1ec7t kê các giá tr\u1ecb gi\u1ed1ng \nnhau. Các giá tr\u1ecb này ph\u1ea3i là s\u1ed1."],"correct":"1","level":"1","hint":"","answer":"Ch\u1ecdn A. <\/strong>Trong b\u1ea3ng t\u1ea7n s\u1ed1, ta ch\u1ec9 li\u1ec7t kê các giá tr\u1ecb khác nhau. Các giá tr\u1ecb này có th\u1ec3 không là s\u1ed1.<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2025-03-02 15:34:15","option_type":"txt","len":3},{"id":"10398","post_id":"7963","mon_id":"1159278","chapter_id":"1159331","question":"Cho dãy d\u1eef li\u1ec7u $x_1,x_2,...,x_n$<\/span>. T\u1ea7n s\u1ed1 t\u01b0\u01a1ng \u0111\u1ed1i $f_i$<\/span> c\u1ee7a giá tr\u1ecb $x_i$<\/span> là:<\/p>","options":["A.<\/strong> t\u1ec9 s\u1ed1 gi\u1eefa t\u1ea7n s\u1ed1 c\u1ee7a $x_i$<\/span> (g\u1ecdi là $m_i$<\/span>) v\u1edbi n.","B.<\/strong> t\u1ec9 s\u1ed1 gi\u1eefa t\u1ea7n s\u1ed1 c\u1ee7a n (g\u1ecdi là $m_i$<\/span>) v\u1edbi $x_i$<\/span>.","C.<\/strong> t\u1ec9 s\u1ed1 ph\u1ea7n tr\u0103m gi\u1eefa t\u1ea7n s\u1ed1 c\u1ee7a $x_i$<\/span> (g\u1ecdi là $m_i$<\/span>) v\u1edbi n.","D.<\/strong> t\u1ec9 s\u1ed1 gi\u1eefa t\u1ea7n s\u1ed1 c\u1ee7a n (g\u1ecdi là $m_i$<\/span>) v\u1edbi $x_i$<\/span>."],"correct":"1","level":"1","hint":"","answer":"Ch\u1ecdn A.<\/strong> t\u1ec9 s\u1ed1 gi\u1eefa t\u1ea7n s\u1ed1 c\u1ee7a $x_i$<\/span> (g\u1ecdi là $m_i$<\/span>) v\u1edbi n.<\/span><\/p>Cho dãy d\u1eef li\u1ec7u $x_1,x_2,...,x_n$<\/span>. T\u1ea7n s\u1ed1 t\u01b0\u01a1ng \u0111\u1ed1i $f_i$<\/span> c\u1ee7a giá tr\u1ecb $x_i$<\/span> là t\u1ec9 s\u1ed1 gi\u1eefa t\u1ea7n s\u1ed1 c\u1ee7a $x_i$<\/span> (g\u1ecdi là $m_i$<\/span>) v\u1edbi n.<\/span><\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2025-03-02 15:38:14","option_type":"math","len":0},{"id":"10399","post_id":"7963","mon_id":"1159278","chapter_id":"1159331","question":"Sau bài thi nói Ti\u1ebfng Anh, cô giáo ghi l\u1ea1i s\u1ed1 l\u1ed7i c\u1ee7a m\u1ed9t s\u1ed1 h\u1ecdc sinh m\u1eafc ph\u1ea3i vào b\u1ea3ng th\u1ed1ng kê sau:<\/p><svg height=\"150\" width=\"320\"> <g><title><\/title><rect fill=\"#fff\" height=\"152\" id=\"canvas_background\" width=\"322\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" id=\"canvasGrid\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" id=\"svg_6\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g><title><\/title><g id=\"svg_9\" stroke=\"null\"> <rect 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y=\"136.49609\">4<\/text> <rect fill=\"#ffff56\" height=\"28.40288\" id=\"svg_112\" stroke=\"#000\" stroke-width=\"1.5\" width=\"39.25\" x=\"198.75001\" y=\"116.09321\"><\/rect> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_113\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.9345238506793976,0,0,1.0143884420394897,0.16369037330150604,-0.050303290829418756) \" x=\"225.5\" xml:space=\"preserve\" y=\"136.49609\">1<\/text> <rect fill=\"#ffff56\" height=\"28.40288\" id=\"svg_115\" stroke=\"#000\" stroke-width=\"1.5\" width=\"39.25\" x=\"238.00001\" y=\"116.09321\"><\/rect> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_116\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.9345238506793976,0,0,1.0143884420394897,0.16369037330150604,-0.050303290829418756) \" x=\"267.5\" xml:space=\"preserve\" y=\"136.49609\">1<\/text> <rect fill=\"#ffff56\" height=\"28.40288\" id=\"svg_118\" stroke=\"#000\" stroke-width=\"1.5\" width=\"39.25\" x=\"277.25001\" y=\"116.09321\"><\/rect> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_119\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.9345238506793976,0,0,1.0143884420394897,0.16369037330150604,-0.050303290829418756) \" x=\"309.5\" xml:space=\"preserve\" y=\"136.49609\">4<\/text> <g id=\"svg_3\" stroke=\"null\"> <rect fill=\"#ffff56\" height=\"28.40288\" id=\"svg_1\" stroke=\"#000\" stroke-width=\"1.5\" width=\"39.25\" x=\"2.5\" y=\"3.49609\"><\/rect> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"24\" id=\"svg_2\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.9345238506793976,0,0,1.0143884420394897,0.16369037330150604,-0.050303290829418756) \" x=\"15.5\" xml:space=\"preserve\" y=\"25.49609\">2<\/text> <\/g> <\/g> <\/g> <\/svg><\/span><\/p>T\u1ed5ng s\u1ed1 h\u1ecdc sinh \u0111\u01b0\u1ee3c giáo viên quan sát (hay còn g\u1ecdi là c\u1ee1 m\u1eabu) là:<\/p>","options":["A.<\/strong> n = 42.","B.<\/strong> n = 40.","C.<\/strong> n = 15.","D.<\/strong> n = 25."],"correct":"2","level":"1","hint":"","answer":"Ch\u1ecdn B.<\/strong> n = 40.<\/span><\/p>T\u1ed5ng s\u1ed1 h\u1ecdc sinh \u0111\u01b0\u1ee3c giáo viên quan sát (hay còn g\u1ecdi là c\u1ee1 m\u1eabu) là: 40 h\u1ecdc sinh.<\/p>","type":"choose","extra_type":"classic","time":"0","user_id":"127","test":"0","date":"2025-03-02 15:40:05","option_type":"txt","len":0}]}