A random variable is defined as a process or variable with a numerical outcome. Which of the following are random variables? The amount of rain, in inches, that will fall next Friday in Dallas, TX.
The major of a randomly drawn student from Arizona State University.
The number of books purchased next year by your local library.

i only
ii only
iii only
i and iii
ii and iii
i, ii, and iii

Aschool typically sells 500 yearbooks each year for 50 dollars each. the economic calls does a project and discovers that they can sell 100 more yearbooks for every $5 decrease in price. the revenue for yearbook sales is equal to the number of yearbooks sold times the price of the yearbook. let x represent the number of $5 decrease in price. if the expression that represents the revenue is written in the form r(x)=(500+ax)(50-bx). to maximize profit, what price should the school charge for the yearbooks? what is the possible maximum revenue? if the school attains the maximum revenue, how many yearbooks will they sell?

25 ! the line of best fit is h = 5a + 86. predict the height at age 16.

The probability that a student graduating from suburban state university has student loans to pay off after graduation is .60. if two students are randomly selected from this university, what is the probability that neither of them has student loans to pay off after graduation?