Paul purchased 3 video games for $17.25 each which expression is the best choice to him determine the total amount of money he spent (.25)=51.75; he spent $51.75 (-3)(17.25)=-51.75; he spent$51.75 (3)(17.25)=51.75; he spent $51.75(-.25)=51.75; he spent $51.75

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?