4× (1,351 - 381) which of the following is true about the expression above? a. the given expression is 4 less than (1,351 - 381). b. the given expression is 4 times smaller than (1,351 - 381). c. the given expression is 4 times as large as (1,351 - 381). d. the given expression is 4 more than (1,351 - 381).

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?