Alexandra was at the pet store purchasing dog food. She compared the prices of 3 different sized bags of food. The small bag cost $13.99 for 6 pounds, the medium bag cost $29.99 for 18 pounds, and the large bag cost $43.99 for 35 pounds. Which bag of dog food cost $2.33 per pound?

small bag

medium bag

large bag

none of these

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?