A copier services company is considering adding an advanced model to its product line but is concerned about excessive maintenance calls. During a trial introduction in a test market, maintenance personnel recorded X, the number of service visits required to get a particular copier up and running to the customer's satisfaction. These data are summarized in the following table:
X Freq(x)
1 20
2 220
3 105
4 50
5 5
What is the average number of service visits required per copier?
Select one:
a. 3.00
b. 5.00
c. None of the above
d. 1.25
e. 2.50