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The frequency distribution of order lead time at Ecommerce.com from Exercise 18 is repeated below.
Lead Time (days)
Frequency
0 up to 5
6
5 up to 10
7
10 up to 15
12
15 up to 20
8
20 up to 25
Total
40
a. How many orders were filled in less than 10 days? In less than 15 days?
b. Convert the frequency distribution to a cumulative frequency distribution.
c. Develop a cumulative frequency polygon.
d. About 60 percent of the orders were filled in less than how many days?
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