For a certain exam,a score of 86 was 5 standard deviations above mean and a score of 67 was 2.5 standard deviations above mean.What was the mean score for the exam?
Pick one.
A) 50  B) 55  C) 48  D) 42  E) 49
Mean+5SD=86   Mean+2.5SD=67   By solving above equations we get,   SD (absolute value)=7.6   Mean=48   ANS. 48
<result>C</result>
For a certain exam,a score of 86 was 5 standard deviations above mean and a score of 67 was 2.5 standard deviations above mean.What was the mean score for the exam?