Israel must choose two different elective classes next year. The list shows all the possible outcomes, in his order of preference Band and painting, painting and chorus, ceramics and band, band and drama, chorus and ceramics, drama and chorus

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

Tom can paint the fence in 12 hours, but if he works together with a friend they can finish the job in 8 hours. how long would it take for his friend to paint this fence alone?

B. two events are dependent if the occurrence of one event changes to occurrence of the second event. true or false