A survey of U.S. adults found that 8% say their favorite sport is auto racing. You randomly

Question:

A survey of U.S. adults found that 8% say their favorite sport is auto racing. You randomly select 400 U.S. adults and ask them to name their favorite sport. Find the probability that the number who say auto racing is their favorite sport is
(a) At most 40,
(b) More than 50,
(c) Between 20 and 30, inclusive,
(d) Identify any unusual events.
Explain.