Unusual events: Divide students into pairs. One member of each pair tosses a coin 20 times. The other member tries to guess the outcome of each toss before it is made. Each pair records the number of correct guesses. What is the distribution of the number of correct guesses out of 20? Did any pair get an unusually large or unusually small number of correct guesses? Discuss whether it would be justified to conclude that the person involved has ESP, or whether there is a better conclusion.