49 Winning at tennis A player serving in tennis has two chances to get a serve into play If the first serve is out the player serves again If the second serve is also out the player loses the point Here are probabilities based on four years of the Wimbledon Championship 20 P 1st serve in 0 59 P win point 1st serve in 0 73 P 2nd serve in 1st serve out 0 86 P win point 1st serve out and 2nd serve in 0 59 Make a tree diagram for the results of the two serves and the outcome win or lose of the point The branches in your tree have different numbers of stages depending on the outcome of the first serve What is the probabil