A Small Diner Has One Employee and a Counter with Seating

Multiple Choice

A small diner has one employee and a counter with seating for 8 customers.The diner does not package food for take out.Customers arrive at the diner at the rate of 20 per hour (Poisson distributed) .Service times are exponentially distributed and average 24 per hour.Customers that arrive when all seats are taken do not enter the diner.What is the probability that the diner is full and an arriving customer does not enter?

A) 0.8333
B) 0.1667
C) 0.2067
D) 0.0481