Using a tree diagram to find the probability of an event. The solution to this problem uses the formulas for complimentary events and for intersections of events.
A sports psychologist performed a study of some visualization techniques that she developed to improve athletic performance. She used amateur golfers and amateur tennis players as participants. In her study 70% of the participants were golfers, and the other 30% were tennis players. (No participant was both a golfer and a tenn