What is the preferred way for people to order fast food? A survey was conducted in 2009, but the sample sizes were not reported. Suppose the results, based on a sample of 100 males and 100 females, were as follows:

If a respondent is selected at random, what is the probability that he or she
a. Prefers to order at the drive-through?
b. Is a male and prefers to order at the drive-through?
c. Is a male or prefers to order at the drive-through?
d. Explain the difference in the results in (b) and (c).