Use the normal distribution of SAT critical reading scores for which the mean is 509 and the standard deviation is 111. Assume the variable x is normally distributed.
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What percent of the SAT verbal scores are less than 550?
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If 1000 SAT verbal scores are randomly selected, about how many would you expect to be greater than 525?

What term makes it inconsistent y=2x - 4

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 of the following represents the length of a diagonal of this trapezoid?