Question

The ages of SHS students enrolled at ISNHS are normally distributed with a mean

of 17 years and a standard deviation of 2.5 years. If a student is selected at

random, what is the probability that his age is under 16 years?

Answer 1

we use z scores

z(16) = (16-17)/ 2.5 = -0.4

using the normal tables we obtain that p(z< -0.4) = 0.34458 which is the required solution.