The CPA Pradlce Adviser reports that the mean preparation fee for 2017 federal Income tax returns was 3273. Use this price as the population mean and assume the population standard deviation of preparation fees is 3100. Use z-tahle. Round your answers to four decimal place. a. What is the probability that the mean price for a sample of 30 federal income tax returns ls within 316 of the population mean? i i b. What is the probability that the mean price for a sample of 50 federal income tax returns is within 316 of the population mean? i l c. What is the probability that the mean price for a sample of 100 federal income tax returns is within .16 of the population mean'lI \\ l 1!. Which, if any. of the sample sizes in parts (a), (b). and (c) would you recommend to have at least a 0.95 probability that the sample mean is within 316 of the population mean