What are the domain and range of the relation {(–9, 5), (1, 5), (6, 11), (7, –10)}?
a.
domain: {–10, 5, 11}; range: {–9, 1, 6, 7};
b.
domain: {–9, 1, 6, 7}; range: {–10, 5, 11}
c.
domain: {1, 5, 6, 7, 11}; range: {–10, –9}
d.
domain: {–9, 1, 6, 7}; range: {–10, –9, 1, 5, 6, 7, 10, 11}

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?