For another question, Nancy needs her to mark the numbers 1 1/3 and -1 1/3 on the number line. How many spaces does she need between 1 and 2, and between -1 and -2, so that she can mark 1 1/3 and -1 1/3?

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