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Question

Assume that police estimate that 12​% of drivers do not wear their seatbelts. They set up a safety​ roadblock,

stopping cars to check for seatbelt use. They stop 40

cars during the first hour.

a. Find the​ mean, variance, and standard deviation of the number of drivers expected not to be wearing seatbelts. Use the fact that the mean of a geometric distribution is mu=1 Over p


μ=1p and the variance is sigma squared =q Over p squared


σ2=qp2.

b. How many cars do they expect to stop before finding a driver whose seatbelt is not​ buckled?

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