Leroy opened a savings account 18 years ago with a deposit of 2,651.43 the account has an interest rate of 2.8% compounded twice a year how much interest has leroy earned ? a) 4,373.68 b) 2,725.67 c) 4,358.69 d) 1,722.25

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?