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
|
7
|
|
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?