Pat is a babysitter and has jobs in 4 different town’s. she can take one of two different trains and then get a ride to her job. train 1 stops every 6 miles. train 2 stops only every 7 miles. she wants to take the train that will stop closest to each town take to get to each of her jobs.

Four airplanes carrying a total of 400 passengersarrive at the detroit airport. the airplanes carry, respectively,50, 80, 110, and 160 passengers. a) one of the 400 passengers is selected uniformly at random. let x denote the number of passengers that were on theairplane carrying the randomly selected passenger. find var(x)for x as given in the problemb) one of the 4 airplane drivers is also selected uniformly atrandom. let y denote the number of passengers on the chosen driver’s airplane. find var(y) for y as given in the problem