A Grocery Store Has Two Identical Checkouts Each Can Serve $\mathrm{L}_{\mathrm{q}}=1.929$

Multiple Choice

A grocery store has two identical checkouts each can serve an average of 20 customers per hour following an exponential distribution. Customers ready to checkout arrive at a common checkout line following Poisson distribution with a rate of 30 per hour. For this system, it is known that $\mathrm{L}_{\mathrm{q}}=1.929$ and $\mathrm{P}_{0}=0.143$ . The average number in the system will be

A) 1.929
B) 2
C) 1.643
D) 3.429