As part of her effort to the earth, melissa wants to plant 50,564 trees in the next 4 years. she planted 10,524 the first year and 8,546 the second year. the third year she planted 2,315 more trees than the first and second year combined. how many more trees does she need to plant the fourth year to reach her goal?

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?