The last time dior made tacos for her family, she spent $5.33 on 1 1/2 pounds of ground beef. she's heading back to the store again to purchase 2.5 pounds of ground beef to make chili. how much will the 2.5 of ground beef cost her if the store hasn't changed ther prices? round your answer to the nearest cent if necessary.

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?