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according to police sources a car with a certain protection system will be recovered 90% of the time. If 600 stolen cars are randomly selected, what is the mean and standard deviation of the number of cars recovered after being stolen?

Respuesta :

The solution to the problem is as follows:

Given: n = 600; p = 0.90; 

mean = np = 600*0.90 = 540 

sd of proportions = √(npq/n) = √(600*0.90*0.10) = 7.35

Mean: 540; standard deviation: 7.35

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