A store offers different brands of a product. It decides to eliminate the brand that is most likely to be returned. The table shows the number of items of

each brand that were returned over the past year and the total sold.

Retums

Total sold

Brand A

40

913

Brand B

38

792

Brand C

21

626

Brand D

15

451

Which brand should the store eliminate?

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?