Ava wants to figure out the average speed she is driving. she starts checking her car’s clock at mile marker 0. it takes her 4 minutes to reach mile marker 3. when she reaches mile marker 6, she notes that 8 minutes total have passed since mile marker 0.

what is average speed of the car in miles per minute?

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