Question

Assume that police estimate that 18​% 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 equals StartFraction 1 Over p EndFraction and the variance is sigma squared equals StartFraction q Over p squared EndFraction . b. How many cars do they expect to stop before finding a driver whose seatbelt is not​ buckled?

Answer 1