Many of a bank's customers use its automatic teller machine to transact business after normal banking hours. During the early evening

hours in the summer months, customers arrive at a certain location at the rate of one every other minute. This can be modeled using a

Polsson distribution. Each customer spends an average of $95$ seconds completing his or her transactions. Transaction time is

exponentially distributed.

a$.$ Determine the average time customers spend at the machine, Including walting In line and completing transactions. $($Do not round

Intermedlate calculations. Round your answer to the nearest whole number.$)$

Average time

minutes

b$.$ Determine the probability that a customer will not have to walt upon arrlving at the automatic teller machine. $($Round your answer to

$2$ decimal places.$)$

Probability

c$.$ Determine the average number of customers walting to use the machine. $($Round your answer to $2$ decimal places.$)$