求助,这题highlight部分怎么理解?思路是什么?prep里这种题出了4道,一句话没明白,就影响4道题。9天就考试了,急!先谢谢了!!
118. 12240-!-item-!-187;#058&008164
For a certain examination, a score of 58 was 2 standard deviations below the mean, and a score of 98 was 3 standard deviations above the mean. What was the mean score for the examination?
(A) 74
(B) 76
(C) 78
(D) 80
(E) 82
同问!!顶!!!
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