I need help answering 4-15

4-15. The marketing manager for the Charlotte Times newspaper has commissioned a study of the advertisements in the classified section. The results for the Wednesday edition showed that 204 are help- wanted ads, 520 are real estate ads, and 306 are other ads. a. If the newspaper plans to select an ad at random each week to be published free, what is the probability that the ad for a specific week will be a help-wanted ad? b. What method of probability assessment is used to determine the probability in part a? c. Are the events that a help-wanted ad is chosen and that an ad for other types of products or services is chosen for this promotion on a specific week mutually exclusive? Explain. 4-16. One automobile dealership sells Buick, Cadillac, and Chevrolet automobiles. It also sells used cars that it gets as trade-ins on new car nurchana