The Economic Policy Institute periodically issues reports on wages of entry level workers. The Institute reported that entry level wages for male college graduates were $21.68 per hour and for female college graduates were $18.80 per hour in 2011 (Economic Policy Institute website, March 30, 2012). Assume the standard deviation for male graduates is $2.30, and for female graduates it is $2.05. Use z-table. Round your answers to four decimal places. a. What is the probability that a sample of so male graduates will provide a sample mean within $. 50 of the population mean, $21.687 (Round z value in Intermediate calculations to 2 decimal places.) 1.60 b. What is the probability that a sample of So female graduates will provide a sample mean within $ 50 of the population mean, $18.80? (Round z value in intermediate calculations to 2 decimal places.) 0.28