1. When helping a student, Mr. Elmer Fudd noticed that the time he spends helping them is exponentially distributed with an average of 2.5 minutes with each student. Determine the probability (to the nearest thousandth) that the next student will have to wait exactly 2 minutes. (Hint: Refer to Question 7 in the Multiple Choice.)

2. On any given work day, there is a 17% probability that Steve will be sick. Determine the probability

that he will be sick exactly 3 work days this week, correct to the nearest tenth of a percent.

3.Gurpreet is a cashier at McDonald's. She has observed that the probability of encountering a "difficult" customer is 0.23. How many people would she expect to serve before she encounters a difficult customer.