Please show work :) confused on this one.

Question 6 Complete 0.00 points out of 0.57 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 Poisson distribution. Each customer spends an average of 90 seconds completing his or her transactions. Transaction time is exponentially distributed. Answer the following questions: Compute the probability that at least 5 customers waiting? (2 decimal points) Flag question Answer: 14.06