Use the following information to answer the following questions. IQ is measured with scores that range from 0-200. Thea mean is 100 and the standard deviation in the population is 15.

What is the probability that a randomly chosen person has an IQ of 115?

Suppose you have a SRS of 9. What is the probability that the sample will have an average IQ of 115?

Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability of the Z score at the ordinate.

Z = (score-mean)/SEm

SEm = SD/√n

Use same table.