Question: 12.21 Testing ESP. In a test for ESP (extrasensory percep tion), a subject is told that cards the experimeiater but not the subject can see

12.21 Testing ESP. In a test for ESP (extrasensory percep tion), a subject is told that cards the experimeiater but not the subject 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 sub ject 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 many rep etitions of the experiment?

(c) What is the probability of exactly 5 correct guesses?

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