106. 11122-!-item-!-187;#058&007588
If a certain sample of data has a mean of 20.0 and a standard deviation of
3.0, which of the following values is more than
2.5 standard deviations from the mean?
(A) 12.0
(B) 13.5
(C) 17.0
(D) 23.5
(E) 26.5
答案是A
這種題目要怎麼解呢??
該不會要代標準差公式吧XD
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.119.232.127