According to the FedSmith.com, the average salary for federal employee in 2012 was $74,804. Suppose the population standard deviation is $15,300. A random sample of 34 federal employees is selected.
A. what is the probability that the sample mean will be less than $70,000.
B. What is the probability that the sample mean will be more than $74,000.
C. What is the probability that the sample mean will be between $76,000 and $81,000.