An IQ test is designed so that the mean is 100 and the standard dieviation is 17 for the population of normal adults. Find the sample size necessary to estimate the mean IO score of statistics students such that it can be said with 90%% confidence that the sample mean is within 8 IQ points of the true mean, Assume that o = 17 and determine the required sample size. The required sample size is (Round up to the nearest integer)