Question $5.$ On average, how many customers are in GTUX$$s internal queue for a tuxedo?

Assume customers do not cancel their items in their shopping carts.

Question $6.$ Thanks to a very successful advertisement campaign featuring Buzz in a tuxedo,

the demand for tuxedos has increased. Now the average interarrival time for tuxedo requests at

GTUX is $3$ days, with a coefficient of variation of $1.$ Other numbers remain unchanged. To

satisfy the increased demand, GTUX is considering acquiring more tuxedos to rent.

How many tuxedos should GTUX own $($whether in GTUX$$s internal stock, in customer$$s

possession, or in transition$)$ so that a customer waits, on average, less than $3$ days to receive

the tuxedo at home? Assume all tuxedos are identical. Recall that it takes $1$ day for a shipped

tuxedo to arrive at a customer's address.