Please show any working out. Any help will be apprciated.
__________________________________________________ __________________________________________________ __
My tennis coach analyses every game that I play. She has found that I get the first serve in about 70% of the time. When I get the first serve in, I win the point about 80% of the time. If I miss the first serve, the second serve goes in about 90% of the time. When this happens, I win the point about 30% of the time.
a) Find the probability that I win a point when I am serving
b) If I win a point while serving, what is the probability that I only
needed one serve?