Temperature affects the speed of sound. the speed (v) of sound near earth's surface, in
meters per second, is given by v = 20vt + 273, where t stands for the temperature of
the air in degrees celsius. if the speed of sounds is 300 meters per second, what is the
temperature in degrees celsius?

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?