Hover-High Helicopters manufactures radio-controlled toy helicopters. They have their quality control down to a point where only 1 in 100 built could be defective and returned for repair at a cost to the company of $50. At a profit margin of $10 per unit, what would their profit be per unit after selling 200 copters? A. -$9.40 per unit
B. $0.60 per unit
C. -$0.60 per unit
D. $9.40 per unit
E. $10.00 per unit

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