{"common":{"save":0,"post_id":"7600","level":1,"total":10,"point":10,"point_extra":0},"segment":[{"id":"5762","post_id":"7600","mon_id":"1159285","chapter_id":"1159394","question":"<p>M\u1ed9t m\u1eabu s\u1ed1 li\u1ec7u ghép nhóm có \u0111\u1ed9 l\u1ec7ch chu\u1ea9n b\u1eb1ng 3 thì có ph\u01b0\u01a1ng sai b\u1eb1ng:<\/p>","options":["<strong>A.<\/strong> <span class=\"math-tex\">$s^2=\\sqrt{3}$<\/span>","<strong>B.<\/strong> <span class=\"math-tex\">$s^2=3$<\/span>","<strong>C.<\/strong> <span class=\"math-tex\">$s^2=9$<\/span>","<strong>D.<\/strong> <span class=\"math-tex\">$s^2=6$<\/span>"],"correct":"3","level":"1","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>C.<\/strong> <span class=\"math-tex\">$s^2=9$<\/span>.<\/span><\/p><p>Ph\u01b0\u01a1ng sai <span class=\"math-tex\">$s^2=9$<\/span>.<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2024-10-13 04:44:38","option_type":"math","len":0},{"id":"5763","post_id":"7600","mon_id":"1159285","chapter_id":"1159394","question":"<p>M\u1ed9t m\u1eabu s\u1ed1 li\u1ec7u ghép nhóm có ph\u01b0\u01a1ng sai b\u1eb1ng 25 thì có \u0111\u1ed9 l\u1ec7ch chu\u1ea9n b\u1eb1ng:<\/p>","options":["<strong>A.<\/strong> 4","<strong>B.<\/strong> 5","<strong>C.<\/strong> 256","<strong>D.<\/strong> 50"],"correct":"2","level":"1","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>B.<\/strong> 5.<\/span><\/p><p>Ta có \u0111\u1ed9 l\u1ec7ch chu\u1ea9n b\u1eb1ng c\u0103n b\u1eadc hai s\u1ed1 h\u1ecdc c\u1ee7a ph\u01b0\u01a1ng sai nên s = 5.<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2024-10-13 04:46:09","option_type":"txt","len":0},{"id":"5764","post_id":"7600","mon_id":"1159285","chapter_id":"1159394","question":"<p>Ch\u1ecdn phát bi\u1ec3u \u0111úng.<\/p>","options":["<strong>A.<\/strong> Ph\u01b0\u01a1ng sai b\u1eb1ng c\u0103n b\u1eadc hai c\u1ee7a giá tr\u1ecb trung bình.","<strong>B.<\/strong> Ph\u01b0\u01a1ng sai b\u1eb1ng c\u0103n b\u1eadc hai c\u1ee7a \u0111\u1ed9 l\u1ec7ch chu\u1ea9n.","<strong>C.<\/strong> Giá tr\u1ecb trung bình b\u1eb1ng bình ph\u01b0\u01a1ng c\u1ee7a \u0111\u1ed9 l\u1ec7ch chu\u1ea9n.","<strong>D.<\/strong> Ph\u01b0\u01a1ng sai b\u1eb1ng bình ph\u01b0\u01a1ng \u0111\u1ed9 l\u1ec7ch chu\u1ea9n."],"correct":"4","level":"1","hint":"","answer":"<p>Ch\u1ecdn <span style=\"color:#16a085;\"><strong>D.<\/strong> Ph\u01b0\u01a1ng sai b\u1eb1ng bình ph\u01b0\u01a1ng \u0111\u1ed9 l\u1ec7ch chu\u1ea9n.<\/span><\/p><p>Ta th\u1ea5y \u0111\u1ed9 l\u1ec7ch chu\u1ea9n <span class=\"math-tex\">$s=\\sqrt{s^2}$<\/span> chính là c\u0103n b\u1eadc hai s\u1ed1 h\u1ecdc c\u1ee7a ph\u01b0\u01a1ng sai.<br \/>V\u1eady ph\u01b0\u01a1ng sai b\u1eb1ng bình ph\u01b0\u01a1ng \u0111\u1ed9 l\u1ec7ch chu\u1ea9n.<\/p>","type":"choose","extra_type":"classic","user_id":"131","test":"0","date":"2024-10-13 04:48:13","option_type":"txt","len":3}]}
