Probability of outcome

Question

If a tennis player won 8 of the last 30 matches, what is probability of % of winning in the next 100 matches.

Answer 1

There is no way of knowing the answer. The last 30 games may have been against his grandmother while the next 100 may be against tennis instructors.

As every prospectus states, "past performance is no guarantee of future success".

Answer 2

8/30 = 4/15

(4/15)^100 = 3.9525122738.... x 10^(-58)