A study of the checkout lines at the MJ Coop revealed that between 4 and 7 p.m. on weekdaysthere is an average of 4 customers waiting in line. What is the probability that a customer visitsthe MJ Coop and finds:

a)Four customers are waiting? Use the Poisson probability distribution to calculate youranswer to six decimal places.

b)Less than four customers waiting. Use the Poisson probability tables to calculate youranswer.