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