The average time between two arrivals of customers at a counter in a ready-made store is 4 min. The average time of the counter clerk to serve the customer is 3 min. The arrivals are distributed as per Poisson distribution and the services art exponential distribution. The probability that a customer arriving at the counter to wait, is:

The average time between two arrivals of customers at a counter in a r

1.	The average time between two arrivals of customers at a counter in a ready-made store is 4 min. The average time of the counter clerk to serve the customer is 3 min. The arrivals are distributed as per Poisson distribution and the services art exponential distribution. The probability that a customer arriving at the counter to wait, is:
A.	Zero
B.	0.25
C.	2 and 3
D.	0.75
Answer» E.

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