Posted by **kevin** on Sunday, March 28, 2010 at 7:51pm.

The mean score on a Math exam was 50% and the standard deviation was 10%. Assume the results were normally distributed.

(a) What percent of students earned a score between 50% and 70%?

(b) If 60 students took the exam, how many got a score between 50% and 70%?

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