It is the end of the semester, and the clubs at school are recording their profits. The Science Club started out with $25 and has increased its balance by an average of $10 per week. The Math Club has saved $15 per week after starting out with $10 at the beginning of the semester.​

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