Psychology and Human Behavior
According to a recent survey, 11% of men ages 50 to 64 now color their hair. Many men feel this is necessary in order to remain competitive in the workplace. Suppose four men ages 50 to 64 are selected at random.
a. What is the probability that all four color their hair?
b. What is the probability that exactly one of the four colors his hair?
c. Suppose none of the four colors his hair. Is there any evidence to suggest that the study's claim is not correct? Justify your answer.