The mean of a population of raw scores is 18 (x = 12). (a) Using the z-table,

The mean of a population of raw scores is 18 (σx = 12).
(a) Using the z-table, what is the relative frequency of sample means above 24 when N = 30?
(b) What is the probability of randomly selecting a sample of 30 participants whose scores produce a mean above 24?