ps1-118. 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
ANS:(A)
請問如何下手?