2. A bank has been receiving complaints from real estate agents that their customers have been waiting too long for mortgage confirmations. The bank prides itself on its mortgage application process and decides to investigate the claims. The bank manager takes a random sample of 20 customers whose mortgage applications have been processed in the last 6 months and finds the following wait times (in days): 5, 7, 22, 4, 12, 9, 9, 14, 3, 6, 5, 8, 10, 17, 12, 10, 9, 4, 3, 13 Assume that the random variable measures the number of days a customer waits for mortgage processing at this bank, and assume that is normally distributed. 2a. Find the sample mean of this data (.