Please help im struggling PLEASE EXPLAIN ANSWER
GEOMETRY
WILL GIVE BRAINLIEST

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

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?