Simmons Market Research conducted a national consumer study of 13,787 respondents. A subset of the respondents was asked to indicate the primary source of the vitamins or mineral supplements they consume. Six out of 10 U.S. adults take vitamins or mineral supplements. Of those who do, 58% indicated a multiple formula was their choice.
a. Calculate the probability that a randomly chosen U.S. adult takes a multiple formula as her or his primary source.
b. Calculate the probability that a randomly chosen U.S. adult does not take a multiple formula.
c. If three U.S. adults were chosen at random, compute the probability that only two of them take a multiple formula as their primary source.