I NEED HELP PLEASE THIS IS FOR A TEST

Which is a reasonable estimate of the amount of water in a small, inflatable pool used by children?

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

Either enter an exact answer in terms of \piπ or use 3.143.14 for \piπ and enter your answer as a decimal.