For a school project Sue interviewed a total of 100 persons

For a school project, Sue interviewed a total of 100 persons who were either lawyers or salesmen. She asked them if they were happy or unhappy with their occupation. Of the 55 lawyers interviewed, 12 were unhappy, however, only 6 of the salesmen were unhappy. Suppose that one of the persons interviewed is selected at random. Find the probability that the person selected is a salesperson

Solution

There are 100 persons.

55 are lawyers.

Therefore, 100-55 = 45 are salespersons.

Thus,

P(salesperson) = 45/100 = 0.45 [ANSWER]