How much would level 2 course cost in the following year

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

Binh says the point of intersections is (0,-3) which statements identify the errors binh made , check all that apply

D. in a discrete probability distribution, the sum of the probabilities for the discrete variables will be > 1. true or false