The CPA Practice Advisor reports that the mean preparation fee for 2017 federal income tax returns was $300, Use this price as the population mean and assume the population standard deviation of preparation fees is $120. Round your answers to four decimal places 1) What is the probability that the mean price for a sample of 30 federal income tax returns is within $20 of the population mean, le within $280 to $3207 (to 4 decimals) 2) What is the probability that the mean price for a sample of so federal income tax returns is more than $3157 (to 4 decimals) 3) What is the probability that the mean price for a sample of 100 federal income tax returns is less than $2752 (to 4 decimals)