ou are planning employees for a bank. You plan for $7$ tellers. Tellers take $18$ minutes per customer, with a standard deviation of $8$ minutes. Customers will arrive one every $3$ minutes according to an exponential distribution $($recall that the standard deviation is equal to the mean$).$ Every customer who arrives eventually gets serviced. Use waiting line approximation to answer the following questions.

On average, how many customers would be waiting in line?

Note: Round your intermediate calculations to $4$ decimal places and final answer to $3$ decimal places.

On average, how long would a customer spend in the bank?

Note: Round your intermediate calculations to $4$ decimal places and final answer to $3$ decimal places.

You decide to consolidate all the cashiers so they can handle all types of customers without increasing the service times.

If a customer arrived, saw the line, and decided not to get in line, that customer has $\_\_\_\_\_\_\_\_$ blank.

multiple choice $1$

reneged

evaded

balked

refused

quit

A customer who enters the line but decides to leave the line before getting service is said to have