Posted by **Tami** on Thursday, January 20, 2011 at 7:44pm.

The mean score on a normally distributed exam is 42 with a standard deviation of 12.1. Which socre would be expected to occur less than 5% of the time?

1) 25

2) 32

3) 60

4) 67

-I know the answer is 67, but i don't know why .. PLEASE help!

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