Olympia Sports store wants to determine whether or not to concentrate its advertising on athletic shoes for the "serious" athlete or the "weekend" athlete. The store also wants to know which type of use is the most popular. The marketing department gathered the following information from randomly selected customers.

a. Find the probability that if one customer is randomly selected he/she is a serious athlete and buys a shoe primarily for running.
b. Find the probability that if one customer is randomly chosen he/she is a serious athlete or an athlete who buys shoes for tennis.
c. Given that a customer buys shoes for basketball, find the probability that the customer is a weekend athlete.
d. If two customers are randomly chosen (without replacement), find the probability that they will both buy shoes primarily fortennis.

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Athlete Tennis Running Basketball SeriouS Weekend 54 36 52 30