According to a study, 89% of adult smokers started smoking when they were underage (less than 21). 10 adult smokers are randomly selected. We are interested in the number of smokers who started smoking when they were underage. Round the probabilities below to 4 decimal places. a) The probability that lesss than 10 of them started smoking before 21 years of age is b) The probability that exactly 9 of them started smoking before 21 years of age is c) What is the expected number of smokers in such a sample who started smoking before they were 21 years old? Submit Question