Which situations are BEST modeled by an exponential function? A)
The cost of gas by the gallon.
B)
The price of bananas by the pound.
O
The interest rate on a home mortgage.
D)
A bacteria colony doubling every hour.
E)
The half-life of a radiative material.

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?