Answer: Our required probability is 0.675.
Explanation:
Since we have given that
Number of wood tennis rackets = 100
Number of graphite tennis rackets = 100
Number of defective wood tennis rackets = 15
Number of defective graphite tennis rackets = 20
So, Probability that the racket is wood or defective is given by
![P(wood)+P(defective)\\\\=(100)/(200)+(35)/(200)\\\\=(135)/(200)\\\\=0.675]()
Hence, our required probability is 0.675.