Do you tailgate the car in front of you? About 35% of all drivers will tailgate before

Question:

Do you tailgate the car in front of you? About 35% of all drivers will tailgate before passing, thinking they can make the car in front of them go faster. Suppose that you are driving a considerable distance on a two-lane highway and are passed by 12 vehicles.
(a) Let r be the number of vehicles that tailgate before passing. Make a histogram showing the probability of r for r = 0 through r = 12.
(b) Compute the expected number of vehicles out of 12 that will tailgate.
(c) Compute the standard deviation of this Distribution
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