Trig. Math
posted by Tami .
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!

is 67 outside two standard deviations?

Im not sure , but say if it was... can u explain it to me?