At mattresses shop, 75% of the mattresses are memory foam and 20% are extra firm. Of the total mattresses at Mattress shop, 12% are extra firm memory foam mattresses. What percentage of the total mattresses are not extra firm non-memory foam mattresses? E. 8
F. 17
G. 63
H. 80

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?