The following table shows the frequencies of executives’ salary ranges at a particular organization:

Salary Range                                                 Frequency

Under $ 60,000             ………………………           2

$ 60,000 to under $ 70,000      …………             5

$ 70,000 to under $ 80,000      …………             7

$ 80,000 to under $ 90,000      ………….            4

$ 90,000 to under $ 100,000    .…………           6

$ 100,000 or more           ……………………          ?

Total                 ………………………………….           26

a. How many executives at this organization earned $ 100,000 or more per year?

b. What is the probability that a randomly selected ­executive earned $ 100,000 or more per year?

c. What is the probability that a randomly selected ­executive earned $ 60,000 or more per year?

d. What is the probability that a randomly selected ­executive earned between $ 70,000 and $ 90,000 per year?