Statistics probability

    17a.Susanne is a member of asportsclubFor each sport she competes in she wins half the matches. After buying a new tennis racket Suzanne plays 10 wins 7 investigate at 10%significance level whether suzannes new racket has made a difference totheprobablility of her winning a match.17b. After buying a new squashed racket Suzanne plays 20 matches. Find the minimum number of matches she must win to conclude at the 10%level of significance that the new racket has improved her performance.