Peggy was taking a timed 60-question test. she was able to correctly answer 70% of the questions but had to skip the rest. how many questions did peggy answer correctly?
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Suppose i flip two identical coins. what is the probability that i get one head and one tail?

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

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