Chester has less than $25 to spend at the county fair. the entrance fee is $5, and each ride costs $3. the number of rides, r, that chester can go on is represented by the inequality 3r + 5 < 25. select the most amount of rides chester can go on without overspending. a: 4 b: 6 c: 9 d: 10

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?