'1. A study of the checkout lines at the Safeway Supermarket in the South Strand area revealed that between 4 and 7 PM. on weekdays there is an average of four customers waiting in line. What is the probability that you visit Safeway today during this period and find: a} No customers are waiting? b} Four customers are waiting? c} Four or fewer are waiting? d} Four or more are waiting? Let the random variable Z follow a standard normal distribution. 3. Find P(Z a 1.20]. b. Find Ptz 151.33]. c. Find P(Z > 4.70}. d. Find Ptz :- l.00}. e. Find P(1.20