Answer to Question #210621 in Statistics and Probability for Ardo

Question

A supermarket cashier attends to customers at an average of 1 every 2 minutes while customers arrive at an average of 20 per hour. Customers are served on first come first served basis from a single point.

Determine the probability that the next arriving customer will have to wait for service

How many customers will an arriving customer meet on the queue?

How long would be expected to spend in the supermarket under the present arrangement?

Why would the supermarket manager worry about a long service queue?