Referring to the contingency table in Problem 4.8, if an employed adult is selected at random, what is the probability that

Table 4.8

Felt Tense or stress out at work
Yes	No
Male	244	495	739
Female	282	480	762
526	975	1501

a. The employed adult felt tense or stressed out at work?

b. The employed adult was a male who felt tense or stressed out at work?

c. The employed adult was a male or felt tense or stressed out at work?

d. Explain the difference in the results in (b) and (c).