Which set of ordered pairs represents a function? { ( − 6 , − 9 ) , ( − 6 , 4 ) , ( − 1 , 9 ) , ( 5 , − 1 ) } {(−6,−−6,−1,,−1)} { ( − 8 , − 2 ) , ( 7 , − 2 ) , ( − 9 , 2 ) , ( 0 , 0 ) } {(−8,−,−−9,,0)} { ( 5 , 8 ) , ( 9 , 7 ) , ( − 3 , − 8 ) , ( 5 , − 5 ) } {(5,,−3,−,−5)} { ( 7 , − 8 ) , ( 7 , − 7 ) , ( 8 , 4 ) , ( 1 , − 3 ) } {(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?