{"common":{"save":0,"post_id":"7602","level":3,"total":10,"point":10,"point_extra":0},"segment":[{"id":"5776","post_id":"7602","mon_id":"1159285","chapter_id":"1159394","question":"<p>B\u1ea1n Chi r\u1ea5t th&iacute;ch nh\u1ea3y hi\u1ec7n \u0111\u1ea1i. Th\u1eddi gian t\u1eadp&nbsp;nh\u1ea3y m\u1ed7i ng&agrave;y trong th\u1eddi gian g\u1ea7n \u0111&acirc;y c\u1ee7a b\u1ea1n Chi&nbsp;\u0111\u01b0\u1ee3c th\u1ed1ng k&ecirc; l\u1ea1i \u1edf b\u1ea3ng sau:<\/p><p><span class=\"svgedit\"><svg height=\"120\" width=\"330\"> <g>&lt;title&gt;&lt;\/title><rect fill=\"#fff\" height=\"122\" id=\"canvas_background\" width=\"332\" 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>&lt;title&gt;&lt;\/title><g id=\"svg_23\" stroke=\"null\"> <rect fill=\"#aaffaa\" height=\"112\" id=\"svg_1\" stroke=\"#000\" stroke-width=\"1.5\" width=\"54.33333\" x=\"2\" y=\"2.25\"><\/rect> <rect fill=\"#fff\" height=\"112\" id=\"svg_2\" stroke=\"#000\" stroke-width=\"1.5\" width=\"54.33333\" x=\"56.33333\" y=\"2.25\"><\/rect> <rect fill=\"#fff\" height=\"112\" id=\"svg_3\" stroke=\"#000\" stroke-width=\"1.5\" width=\"54.33333\" x=\"110.66666\" y=\"2.25\"><\/rect> <rect fill=\"#fff\" height=\"112\" id=\"svg_4\" stroke=\"#000\" stroke-width=\"1.5\" width=\"54.33333\" x=\"165\" y=\"2.25\"><\/rect> <rect fill=\"#fff\" height=\"112\" id=\"svg_5\" stroke=\"#000\" stroke-width=\"1.5\" width=\"54.33333\" x=\"219.33333\" y=\"2.25\"><\/rect> <rect fill=\"#fff\" height=\"112\" id=\"svg_6\" stroke=\"#000\" stroke-width=\"1.5\" width=\"54.33333\" x=\"273.66666\" y=\"2.25\"><\/rect> <line fill=\"none\" fill-opacity=\"null\" id=\"svg_8\" stroke=\"#000\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"2\" x2=\"328\" y1=\"67.94231\" y2=\"67.94231\"><\/line> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_9\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.5568219447799652,0,0,1.0769230952018347,2.6391742056012535,-0.48076934501146695) \" x=\"3.42605\" xml:space=\"preserve\" y=\"24.53571\">Th\u1eddi gian<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_10\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6392887557057608,0,0,1.0769230952018345,2.818118103434956,-2.480769345011467) \" x=\"12\" xml:space=\"preserve\" y=\"54.39286\">(ph&uacute;t)<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_11\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.5777828034044293,0,0,1.0769230952018345,1.9291363190284967,-1.4807693450114667) \" x=\"6\" xml:space=\"preserve\" y=\"92.46429\">S\u1ed1 ng&agrave;y<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_12\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.7671442702447485,0,0,1.0769230952018345,5.865438557924068,-1.4807693450114667) \" x=\"68\" xml:space=\"preserve\" y=\"36.46429\">[20;25)<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_13\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.7671442702447485,0,0,1.0769230952018345,5.865438557924068,-1.4807693450114667) \" x=\"141.03874\" xml:space=\"preserve\" y=\"36.46429\">[25;30)<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_14\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.7671442702447485,0,0,1.0769230952018345,5.865438557924068,-1.4807693450114667) \" x=\"210.75753\" xml:space=\"preserve\" y=\"36.46429\">[30;35)<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_15\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.7671442702447485,0,0,1.0769230952018345,5.865438557924068,-1.4807693450114667) \" x=\"281.58297\" xml:space=\"preserve\" y=\"36.46429\">[35;40)<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_16\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.7671442702447485,0,0,1.0769230952018345,5.865438557924068,-1.4807693450114667) \" x=\"352.40842\" xml:space=\"preserve\" y=\"36.46429\">[40;45)<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_18\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.8489583171904087,0,0,1.0769230952018347,0.3020833656191826,-0.48076934501146695) \" x=\"92\" xml:space=\"preserve\" y=\"89.53571\">6<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_19\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.8489583171904087,0,0,1.0769230952018347,0.3020833656191826,-0.48076934501146695) \" x=\"156\" xml:space=\"preserve\" y=\"89.53571\">6<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_20\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.8489583171904087,0,0,1.0769230952018347,0.3020833656191826,-0.48076934501146695) \" x=\"218\" xml:space=\"preserve\" y=\"89.53571\">4<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_21\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.8489583171904087,0,0,1.0769230952018347,0.3020833656191826,-0.48076934501146695) \" x=\"283\" xml:space=\"preserve\" y=\"89.53571\">1<\/text> <text fill=\"#000000\" fill-opacity=\"null\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_22\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.8489583171904087,0,0,1.0769230952018347,0.3020833656191826,-0.48076934501146695) \" x=\"346\" xml:space=\"preserve\" y=\"89.53571\">1<\/text> <\/g> <\/g> <\/svg><\/span><\/p><p>Ph\u01b0\u01a1ng sai c\u1ee7a m\u1eabu s\u1ed1 li\u1ec7u gh&eacute;p nh&oacute;m c&oacute; gi&aacute; tr\u1ecb g\u1ea7n&nbsp;nh\u1ea5t v\u1edbi gi&aacute; tr\u1ecb n&agrave;o d\u01b0\u1edbi \u0111&acirc;y?<\/p>","options":["<strong>A.<\/strong> 31,77.","<strong>B.<\/strong> 32.","<strong>C.<\/strong> 31.","<strong>D. <\/strong>31,25."],"correct":"4","level":"3","hint":"<p>S\u1eed d\u1ee5ng c&ocirc;ng th\u1ee9c t&iacute;nh ph\u01b0\u01a1ng sai.<\/p>","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>D.&nbsp;<\/strong>31,25.<\/span><\/p><p>S\u1ed1 trung b&igrave;nh:<\/p><p>&nbsp;<span class=\"math-tex\">$\\overline{x}=\\dfrac{6.22,5+6.27,5+4.32,5+37,5+42,5}{18}\\approx 28,33$<\/span><\/p><p>Ph\u01b0\u01a1ng sai:<\/p><p>&nbsp;<span class=\"math-tex\">$S^2=\\dfrac{6.22,5^2+6.27,5^2+4.32,5^2+37,5^2+42,5^2}{18}- 28,33^2=31,25$<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2024-10-13 05:45:11","option_type":"txt","len":0},{"id":"5779","post_id":"7602","mon_id":"1159285","chapter_id":"1159394","question":"<p>D\u0169ng l&agrave; h\u1ecdc sinh r\u1ea5t gi\u1ecfi ch\u01a1i rubik, b\u1ea1n c&oacute; th\u1ec3&nbsp;gi\u1ea3i nhi\u1ec1u lo\u1ea1i kh\u1ed1i rubik kh&aacute;c nhau. Trong m\u1ed9t l\u1ea7n t\u1eadp&nbsp;luy\u1ec7n gi\u1ea3i kh\u1ed1i rubik 3 x 3, b\u1ea1n D\u0169ng \u0111&atilde; t\u1ef1 th\u1ed1ng k&ecirc; l\u1ea1i&nbsp;th\u1eddi gian gi\u1ea3i rubik trong 25 l\u1ea7n gi\u1ea3i li&ecirc;n ti\u1ebfp \u1edf b\u1ea3ng&nbsp;sau:<\/p><p><span class=\"svgedit\"><svg height=\"130\" width=\"320\"> <g>&lt;title&gt;&lt;\/title><rect fill=\"#fff\" height=\"132\" id=\"canvas_background\" width=\"322\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" id=\"canvasGrid\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" id=\"svg_22\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g>&lt;title&gt;&lt;\/title><g id=\"svg_23\" stroke=\"null\"> <rect fill=\"#aaff56\" height=\"120\" id=\"svg_1\" stroke=\"#000\" stroke-width=\"1.5\" width=\"62.10366\" x=\"3.50387\" y=\"4.43181\"><\/rect> <g id=\"svg_7\" stroke=\"null\"> <rect fill=\"none\" height=\"120\" id=\"svg_2\" stroke=\"#000\" stroke-width=\"1.5\" width=\"50.45122\" x=\"65.60753\" y=\"4.43181\"><\/rect> <rect fill=\"none\" height=\"120\" id=\"svg_3\" stroke=\"#000\" stroke-width=\"1.5\" width=\"50.45122\" x=\"116.05874\" y=\"4.43181\"><\/rect> <rect fill=\"none\" height=\"120\" id=\"svg_4\" stroke=\"#000\" stroke-width=\"1.5\" width=\"50.45122\" x=\"166.50996\" y=\"4.43181\"><\/rect> <rect fill=\"none\" height=\"120\" id=\"svg_5\" stroke=\"#000\" stroke-width=\"1.5\" width=\"50.45122\" x=\"216.96117\" y=\"4.43181\"><\/rect> <rect fill=\"none\" height=\"120\" id=\"svg_6\" stroke=\"#000\" stroke-width=\"1.5\" width=\"50.45122\" x=\"267.41239\" y=\"4.43181\"><\/rect> <\/g> <line fill=\"none\" id=\"svg_8\" stroke=\"#000\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"2.86363\" x2=\"317.22336\" y1=\"73.00324\" y2=\"73.00324\"><\/line> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_9\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6402438677405086,0,0,1.0084033404745618,1.0302084733057388,-2.0540486884757705) \" x=\"6.86363\" xml:space=\"preserve\" y=\"30.43181\">Th\u1eddi gian<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-style=\"normal\" font-weight=\"bold\" id=\"svg_10\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6402438677405086,0,0,1.0084033404745618,1.0302084733057388,-2.0540486884757705) \" x=\"21.86363\" xml:space=\"preserve\" y=\"58.43181\">(gi&acirc;y)<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_11\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6402438677405086,0,0,1.0084033404745618,1.0302084733057388,-2.0540486884757705) \" x=\"16.86363\" xml:space=\"preserve\" y=\"104.43181\">S\u1ed1 l\u1ea7n<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_12\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6402438677405086,0,0,1.0084033404745618,1.0302084733057388,-2.0540486884757705) \" x=\"111.86363\" xml:space=\"preserve\" y=\"43.43181\">[8; 10)<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_13\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6402438677405086,0,0,1.0084033404745618,1.0302084733057388,-2.0540486884757705) \" x=\"183.86363\" xml:space=\"preserve\" y=\"43.43181\">[10; 12)<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_14\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6402438677405086,0,0,1.0084033404745618,1.0302084733057388,-2.0540486884757705) \" x=\"263.86363\" xml:space=\"preserve\" y=\"43.43181\">[12; 14)<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_15\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6402438677405086,0,0,1.0084033404745618,1.0302084733057388,-2.0540486884757705) \" x=\"342.86362\" xml:space=\"preserve\" y=\"43.43181\">[14; 16)<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_16\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6402438677405086,0,0,1.0084033404745618,1.0302084733057388,-2.0540486884757705) \" x=\"420.86362\" xml:space=\"preserve\" y=\"43.43181\">[16; 18)<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_17\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6402438677405086,0,0,1.0084033404745618,1.0302084733057388,-2.0540486884757705) \" x=\"130.86363\" xml:space=\"preserve\" y=\"104.43181\">4<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_18\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6402438677405086,0,0,1.0084033404745618,1.0302084733057388,-2.0540486884757705) \" x=\"211.86363\" xml:space=\"preserve\" y=\"104.43181\">6<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_19\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6402438677405086,0,0,1.0084033404745618,1.0302084733057388,-2.0540486884757705) \" x=\"285.86363\" xml:space=\"preserve\" y=\"104.43181\">8<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_20\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6402438677405086,0,0,1.0084033404745618,1.0302084733057388,-2.0540486884757705) \" x=\"367.86362\" xml:space=\"preserve\" y=\"104.43181\">4<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_21\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6402438677405086,0,0,1.0084033404745618,1.0302084733057388,-2.0540486884757705) \" x=\"446.86362\" xml:space=\"preserve\" y=\"104.43181\">3<\/text> <\/g> <\/g> <\/svg><\/span><\/p><p>\u0110\u1ed9 l\u1ec7ch chu\u1ea9n c\u1ee7a m\u1eabu s\u1ed1 li\u1ec7u gh&eacute;p nh&oacute;m c&oacute; gi&aacute; tr\u1ecb&nbsp;g\u1ea7n nh\u1ea5t v\u1edbi gi&aacute; tr\u1ecb n&agrave;o d\u01b0\u1edbi \u0111&acirc;y?<\/p>","options":["<strong>A.<\/strong> 5,98","<strong>B.<\/strong> 6","<strong>C.<\/strong> 2,44","<strong>D.<\/strong> 2,5"],"correct":"3","level":"3","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>C.<\/strong>&nbsp;2,44<\/span><\/p><p>S\u1ed1 trung b&igrave;nh:<\/p><p>&nbsp;<span class=\"math-tex\">$\\overline{x}=\\dfrac{4.9+6.11+8.13+4.15+3.17}{25}=12,68$<\/span><\/p><p>\u0110\u1ed9 l\u1ec7ch chu\u1ea9n:<\/p><p>&nbsp;<span class=\"math-tex\">$\\sigma=\\sqrt{\\dfrac{4.9^2+6.11^2+8.13^2+4.15^2+3.17^2}{25}- 12,68^2}\\approx 2,44$<\/span><\/p>","type":"choose","extra_type":"shape1","user_id":"131","test":"0","date":"2024-10-13 05:51:52","option_type":"txt","len":0},{"id":"5780","post_id":"7602","mon_id":"1159285","chapter_id":"1159394","question":"<p>Kh\u1ea3o s&aacute;t th\u1eddi gian ch\u01a1i th\u1ec3 thao trong m\u1ed9t&nbsp;ng&agrave;y c\u1ee7a 42 h\u1ecdc sinh \u0111\u01b0\u1ee3c cho trong b\u1ea3ng sau (th\u1eddi&nbsp;gian \u0111\u01a1n v\u1ecb ph&uacute;t):<\/p><p><span class=\"svgedit\"><svg height=\"130\" width=\"320\"> <g>&lt;title&gt;&lt;\/title><rect fill=\"#fff\" height=\"132\" id=\"canvas_background\" width=\"322\" x=\"-1\" y=\"-1\"><\/rect> <g display=\"none\" id=\"canvasGrid\"> <rect fill=\"url(#gridpattern)\" height=\"100%\" id=\"svg_22\" stroke-width=\"0\" width=\"100%\" x=\"0\" y=\"0\"><\/rect> <\/g> <\/g> <g>&lt;title&gt;&lt;\/title><g id=\"svg_23\" stroke=\"null\"> <rect fill=\"#aaff56\" height=\"123\" id=\"svg_1\" stroke=\"#000\" stroke-width=\"1.5\" width=\"62.10366\" x=\"3.50387\" y=\"4.43181\"><\/rect> <g id=\"svg_7\" stroke=\"null\"> <rect fill=\"none\" height=\"123\" id=\"svg_2\" stroke=\"#000\" stroke-width=\"1.5\" width=\"50.45122\" x=\"65.60753\" y=\"4.43181\"><\/rect> <rect fill=\"none\" height=\"123\" id=\"svg_3\" stroke=\"#000\" stroke-width=\"1.5\" width=\"50.45122\" x=\"116.05873\" y=\"4.43181\"><\/rect> <rect fill=\"none\" height=\"123\" id=\"svg_4\" stroke=\"#000\" stroke-width=\"1.5\" width=\"50.45122\" x=\"166.50995\" y=\"4.43181\"><\/rect> <rect fill=\"none\" height=\"123\" id=\"svg_5\" stroke=\"#000\" stroke-width=\"1.5\" width=\"50.45122\" x=\"216.96116\" y=\"4.43181\"><\/rect> <rect fill=\"none\" height=\"123\" id=\"svg_6\" stroke=\"#000\" stroke-width=\"1.5\" width=\"50.45122\" x=\"267.41237\" y=\"4.43181\"><\/rect> <\/g> <line fill=\"none\" id=\"svg_8\" stroke=\"#000\" stroke-linecap=\"null\" stroke-linejoin=\"null\" stroke-opacity=\"null\" stroke-width=\"1.5\" x1=\"2.86363\" x2=\"317.22334\" y1=\"74.71753\" y2=\"74.71753\"><\/line> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_9\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6402438271098697,0,0,1.0336134549084819,1.0302085896568576,-2.2161953521272295) \" x=\"6.86363\" xml:space=\"preserve\" y=\"30.43181\">Th\u1eddi gian<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-style=\"normal\" font-weight=\"bold\" id=\"svg_10\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6402438271098697,0,0,1.0336134549084819,1.0302085896568576,-2.2161953521272295) \" x=\"21.86363\" xml:space=\"preserve\" y=\"58.43181\">(ph&uacute;t)<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" font-weight=\"bold\" id=\"svg_11\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.4943185028365476,0,0,1.3545276626604013,-1.3941555918653679,-29.812203995639535) \" x=\"16.86363\" xml:space=\"preserve\" y=\"102.91837\">S\u1ed1 h\u1ecdc sinh<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_12\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6402438271098697,0,0,1.0336134549084819,1.0302085896568576,-2.2161953521272295) \" x=\"111.86363\" xml:space=\"preserve\" y=\"43.43181\">[0; 20)<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_13\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6402438271098697,0,0,1.0336134549084819,1.0302085896568576,-2.2161953521272295) \" x=\"183.86363\" xml:space=\"preserve\" y=\"43.43181\">[20; 40)<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_14\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6402438271098697,0,0,1.0336134549084819,1.0302085896568576,-2.2161953521272295) \" x=\"263.86363\" xml:space=\"preserve\" y=\"43.43181\">[40; 60)<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_15\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6402438271098697,0,0,1.0336134549084819,1.0302085896568576,-2.2161953521272295) \" x=\"342.86362\" xml:space=\"preserve\" y=\"43.43181\">[60; 80)<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_16\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.5949269625489905,0,0,1.0336134549084819,17.400009999231422,-2.2161953521272295) \" x=\"423.02035\" xml:space=\"preserve\" y=\"43.43181\">[80; 100)<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_17\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6402438271098697,0,0,1.0336134549084819,1.0302085896568576,-2.2161953521272295) \" x=\"130.86363\" xml:space=\"preserve\" y=\"104.43181\">5<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_18\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6402438271098697,0,0,1.0336134549084819,1.0302085896568576,-2.2161953521272295) \" x=\"211.86363\" xml:space=\"preserve\" y=\"104.43181\">9<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_19\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6402438271098697,0,0,1.0336134549084819,1.0302085896568576,-2.2161953521272295) \" x=\"285.86363\" xml:space=\"preserve\" y=\"104.43181\">12<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_20\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6402438271098697,0,0,1.0336134549084819,1.0302085896568576,-2.2161953521272295) \" x=\"367.86362\" xml:space=\"preserve\" y=\"104.43181\">10<\/text> <text fill=\"#000000\" font-family=\"Helvetica, Arial, sans-serif\" font-size=\"20\" id=\"svg_21\" stroke=\"#000\" stroke-opacity=\"null\" stroke-width=\"0\" text-anchor=\"start\" transform=\"matrix(0.6402438271098697,0,0,1.0336134549084819,1.0302085896568576,-2.2161953521272295) \" x=\"446.86362\" xml:space=\"preserve\" y=\"104.43181\">6<\/text> <\/g> <\/g> <\/svg><\/span><\/p><p>Ph\u01b0\u01a1ng sai c\u1ee7a m\u1eabu s\u1ed1 li\u1ec7u \u0111\u01b0\u1ee3c l&agrave;m tr&ograve;n \u0111\u1ebfn ch\u1eef s\u1ed1&nbsp;th\u1eadp ph&acirc;n th\u1ee9 nh\u1ea5t l&agrave;<\/p>","options":["<strong>A.<\/strong> 598","<strong>B.<\/strong> 597","<strong>C.<\/strong> 2477,1","<strong>D.<\/strong> 256,2"],"correct":"1","level":"3","hint":"","answer":"<p>Ch\u1ecdn&nbsp;<span style=\"color:#16a085;\"><strong>A.<\/strong>&nbsp;598<\/span><\/p><p>Trung b&igrave;nh th\u1eddi gian ch\u01a1i th\u1ec3 thao trong m\u1ed9t ng&agrave;y c\u1ee7a&nbsp;m\u1ed9t h\u1ecdc sinh l&agrave;:<\/p><p><span class=\"math-tex\">$\\overline{x}=\\dfrac{10.5+30.9+50.12+70.10+90.6}{42}=\\dfrac{360}{7}$<\/span><\/p><p>Ph\u01b0\u01a1ng sai c\u1ee7a m\u1eabu s\u1ed1 li\u1ec7u l&agrave;:<\/p><p><span class=\"math-tex\">$S^2=\\dfrac{10^2.5+30^2.9+50^2.12+70^2.10+90^2.6}{42}- \\bigg(\\dfrac{360}{7}\\bigg)^2=\\dfrac{29300}{49}\\approx 598$<\/span><\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2024-10-15 01:00:28","option_type":"txt","len":0}]}