The probability that an individual commutes to work by car i

The probability that an individual commutes to work by car is 0.9. If ten neighbors are studied, what is the probability that ten neighbors all commute by car, and what is the average number of neighbors who commute to work by car?

Solution

P(all 10 commute by car)= (0.9)^10 =0.348678

Average number of neighbours who commute to work by car= 0.9