A recent survey found that 38% of all adults over age 81 have
some of the symptoms of Alzheimer’s disease. In a random sample of
27 adults over age 81, what is the probability that at least 15 of
the adults have some deafness of the symptoms of Alzheimer’s
disease?
A soda pop manufacturer runs a contest and places a winning
bottle cap on every sixth bottle. If a person buys the soda pop,
find the probability that the person will:
(a) win on the first purchase
(b) win on the third purchase
(c) win on at most the first five purchases.