5. a. (11 + x) is positive, but (4 + x) is negative, what is one number that could
be?
X =
b. If(-3 + y) is positive, but (-9 + y) is negative, what is one number that y could
be?
c. If(-5 + 2) is positive, but (-6 + 2) is negative, what is one number that could
be?

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?