SOLUTION: Some town planners are thinking about introducing rail to ease congestion on the country’s roads. It is known that commuters are split on the decision and sixteen commuters are

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Question 911268: Some town planners are thinking about introducing rail to ease
congestion on the country’s roads. It is known that commuters are
split on the decision and sixteen commuters are polled.
a. What is the probability that 13 of these persons want rail?
b. What is the probability that all 16 do not want rail?
c. What is the least number of persons to prefer rail before you
believe that there is a preference for rail?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
p(want rail) = 1/2, n = 16
P(x = 13)= binonpdf(16,.5,13)
P(x = 0) = .5^16
c. 9 (split in general 50/50)