A1-mile hiking path has signs placed every 240 feet. there are signs placed at the beginning and the end of the mile. how many signs are there

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

Which one ? is the answer and how to find this answer

What is not true about kl and mn? what is mn? (show )