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4.13Each month a brokerage house studies various companies and rates each

company's stock as being either "Iow risk" or "moderate to high risk." In a recent report, the brokerage house summarized its findings about 15 aerospace companies and 25 food retailers in the following table:

Company Type

Aerospace companyLow Risk

Moderate to High Risk

Food retailer6

9

15

10

If we randomly select one of the total of 40 companies, find

a. The probability that the company is a food retailer.

b. The probability that the company's stock is "Iow risk."

c. The probability that the company's stock is "moderate to high risk."

d. The probability that the company is a food retailer and has a stock that is "Iow risk."

e. The probability that the company is a food retailer or has a stock that is "Iow risk."