A retail manager in a discount store wants to establish a policy of the number of cashiers to have on hand and also when to open a new cash register. The first step in this proces is to determine the rate at which customers arrive at the cash register. One day, the man- ager observes the following times (in minutes) between arrivals of customers at the cash registers:

Intermediate Algebra
19th Edition
ISBN:9780998625720
Author:Lynn Marecek
Publisher:Lynn Marecek
Chapter12: Sequences, Series And Binomial Theorem
Section12.3: Geometric Sequences And Series
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A retail manager in a discount store wants to establish a policy of the number of cashiers
to have on hand and also when to open a new cash register. The first step in this process
is to determine the rate at which customers arrive at the cash register. One day, the man-
ager observes the following times (in minutes) between arrivals of customers at the cash
registers:
0.1
2.6
2.9
0.5
1.2
1.8
4.8
3.3
1.7
0.2
1.5
2.0
4.2
0.6
1.0
2.6
0.9
3.4
1.7
0.4
a Plot a CDF based on these data.
b What kind of theoretical distribution do you think would be appropriate for these
data? Why?
c Calculate the sample mean and sample standard deviation of the data, and use these
to estimate parameters for the theoretical distribution chosen in part b.
d Plot a few points from the CDF of your theoretical distribution, and draw a smooth
curve through them. How does this theoretical curve compare to the data-based CDF?
Transcribed Image Text:A retail manager in a discount store wants to establish a policy of the number of cashiers to have on hand and also when to open a new cash register. The first step in this process is to determine the rate at which customers arrive at the cash register. One day, the man- ager observes the following times (in minutes) between arrivals of customers at the cash registers: 0.1 2.6 2.9 0.5 1.2 1.8 4.8 3.3 1.7 0.2 1.5 2.0 4.2 0.6 1.0 2.6 0.9 3.4 1.7 0.4 a Plot a CDF based on these data. b What kind of theoretical distribution do you think would be appropriate for these data? Why? c Calculate the sample mean and sample standard deviation of the data, and use these to estimate parameters for the theoretical distribution chosen in part b. d Plot a few points from the CDF of your theoretical distribution, and draw a smooth curve through them. How does this theoretical curve compare to the data-based CDF?
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