From a population of size 400, a random sample of 40 items is selected. the median of the sample group of answer choices must be 200, since 400 divided by 2 is 200 must be 10, since 400 divided by 400 is 10 must be equal to the median of population, if the sample is truly random none of these alternatives is correct.

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