Trig. Math

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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!

  • Trig. Math -

    is 67 outside two standard deviations?

  • Trig. Math -

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

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