16. At a test center hosting employment exams, the testing firm needs to plan for proper staffing. Historical data suggests that the average number of applicants arriving per 20-minute period is 1.5. a. What is the best distribution to represent the number of applicant arrivals per 20minute period? (1 point) b. If five or more applicants arrive during an hour, the testing center needs to add one more staff member for that hour to proctor and evaluate exams. If the test center operates 50 hours per week, during how many of those 50 hours do we expect to need the extra staff member? (No need to round your answer to an integer for this one) (8 points) c. What distribution best represents the time between applicant arrivals at the test center, and what is the mean of that distribution (in minutes)? (3 points) d. If an applicantjust arrived, what is the probability that the next applicant will arrive more than 20 minutes from now? (4 points)