I'm messing up with either one step or multiple, any help I'm grateful for, thank you!

Benny the Barber owns a one-chair shop. At barber college, they told Benny that his customers would exhibit a Poisson arrival distribution and that he would provide an exponential service distribution. His market survey data indicate that customers arrive at a rate of 2.0 per hour. It will take Benny an average of 25 minutes to give a haircut. Based on these figures, find the following:

The average number of customers waiting.

Note: Round your intermediate calculations to 3 decimal places and final answer to 2 decimal places.

Average number of customers waiting ____

The average time a customer waits.

Note: Round your answer to 2 decimal places.

Average waiting time ____ minutes

The average time a customer is in the shop.

Note: Round your intermediate calculations to 3 decimal places and final answer to 1 decimal place.

Average time ____ minutes

The average utilization of Bennys time.

Note: Round your intermediate calculations to 3 decimal places and final answer to 1 decimal place.

Average utilization ___%