Please explain to me how to get the answers.

1) You are planning employees for a bank. You plan for 5 tellers. Tellers take 8 minutes customer with a standard deviation of 5 minutes. Customers will arrive one every 2 minut according to an exponential distribution (recall that the standard deviation is equal to the mean for the exponential distribution). Every customer that arrives eventually gets servic Use waiting line approximation to answer the following questions. a. On average, how many customers would be waiting in line? (Hint: Use Little's law) (Answer=1.605) b. On average, how long (in minutes) would a customer spend in the bank? (Hint: Ws=Wq+1/)( Answer =11.21)