Each week, Mrs. Stafford picks a runner from her homeroom to run errands. In order to remain unbiased in her selection, she flips a coin to determine if
the runner will be a boy or a girl. She assigns heads to girls and tails to boys.
1. Based on this procedure, what is the probability of
selecting a boy?
2. Suppose after 20 weeks, Mrs. Stafford has tossed tails
16 times. Based on this observed frequency, what is the probability that a
boy will be selected next week?