For 14, 15, and 16 you would move the decimal the number in the exponent to the left because the exponent is negative. For example 14 would be .00000030
The probability is 0.3707.
We calculate the z-score associated with this using the formula
z = (X-μ)/σ = (67-68)/3 = -1/3 = -0.33
Using a z-table (http://www.z-table.com) we see that the area under the curve to the left of this (less than) is 0.3707.
Hope this helps and hope u can see it
Your teacher might have rounded in order to get her answer.
