Wendy’s Drive-Through Cars arrive at Wendy’s drive-through
Chapter 6, Problem 19E(choose chapter or problem)
Problem 19E
Wendy’s Drive-Through Cars arrive at Wendy’s drive-through at a rate of 0.2 car per minute between the hours of 11:00 p.m. and 1:00 a.m. on Saturday evening. Wendy’s begins an advertising blitz that touts its late-night service. After one week of advertising, Wendy’s officials count the number of cars, X, arriving at Wendy’s drive-through between the hours of 12:00 midnight and 12:30 a.m. at 200 of its restaurants. The results are shown in the following table:
x(number of cars arriving) |
Frequency |
1 |
4 |
2 |
5 |
3 |
13 |
4 |
23 |
5 |
25 |
6 |
28 |
7 |
25 |
8 |
27 |
9 |
21 |
10 |
15 |
11 |
5 |
12 |
3 |
13 |
2 |
14 |
2 |
15 |
0 |
16 |
2 |
(a) Construct a probability distribution for the random variable X, assuming it follows a Poisson process with λ = 0.2 and t = 30. This is the probability distribution of X before the advertising.
(b) Compute the expected number of restaurants that will have 0 arrivals, 1 arrival, and so on.
(c) Compare these results with the number of arrivals after the advertising. Does it appear the advertising was effective? Why?
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