9. The GA Housing Report reports that the mean monthly rent for a one-bedroom apartment in Atlanta is $2631. Assume the standard deviation is $500. A real estate firm samples 100 apartments. a. What is the probability that the sample mean rent is greater than $2700? b. What is the probability that the sample mean rent is between $2500 and $2600? c. Can you tell whether it would be unusual if the sample mean were greater than $2800