Question: 6.91 Multiple choice: Guess answers A question has four possible answers, only one of which is correct. You randomly guess the correct response. With 20

6.91 Multiple choice: Guess answers A question has four possible answers, only one of which is correct. You randomly guess the correct response. With 20 such questions, the distribution of the number of incorrect answers

a. is binomial with n = 20 and p = 0.25.

b. is binomial with n = 20 and p = 0.50.

c. has mean equal to 10.

d. has probability 1.75220 that all 20 guesses are incorrect.

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