1)Which of the ordered pairs is NOT a function?
a) {(3,3),(3,4),(4,5),(4,6)}
b) {(0,8),(8,4),(2,7),(-2,6)}
c) { (-1,3), (1,7), (7,4),(-3,8) }
d) {(-6,5),(5,1), (7,4),(-3,8) }

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?