Juanita is watering her lawn using the water stored in her rainwater tank. The water level
in the tank drops _
1
3 inch every 10 minutes
she waters.
a. What is the change in the tank’s water
level after 1 hour?
b. What is the expected change in the
tank’s water level after 2.25 hours?
c. If the tank’s water level is 4 feet, how
many days can Juanita water if she
waters for 15 minutes each day?

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?