The number of goldfish in a tank is 19, and the volume of the tank is 52 cubic feet. What is the density of the tank? 0.22 goldfish per cubic foot 0.27 goldfish per cubic foot 0.33 goldfish per cubic foot 0.37 goldfish per cubic foot

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?