How many more people spent less than $20 than spent at least $20? A. 20
B. 60
C. 80
D. 100

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Solve the system of equations. y= 2x y= x^2 - 15

What value of x is in the solution set of 4x - 12 s 16 + 8x? -10 -9 -8 -7

In a test for esp (extrasensory perception), a subject is told that cards only the experimenter can see contain either a star, a circle, a wave, or a square. as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. a subject who is just guessing has probability 0.25 of guessing correctly on each card. a. the count of correct guesses in 20 cards has a binomial distribution. what are n and p? b. what is the mean number of correct guesses in 20 cards for subjects who are just guessing? c. what is the probability of exactly 5 correct guesses in 20 cards if a subject is just guessing?