Problem $2)$ The customer flow at a book shop is captured in the following process flow diagram:

What is the average number of customers in the book shop?

$25\mathrm{.}5$

$18\mathrm{.}3$

$28$

$12\mathrm{.}9$

Question $3$

Problem $2)$ The customer flow at a book shop is captured in the following process flow diagram:

What is the average time spent by a customer waiting in line to pay?

$6$min

$9$min

$12$min

$15$min