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