SOLUTION: A sample of 100 wood and 100 graphite tennis rackets are taken from the warehouse. If 9 wood and 19 graphite are defective and one racket is randomly selected from the sample, fin

Question 994434: A sample of 100 wood and 100 graphite tennis rackets are taken from the warehouse. If 9 wood
and 19 graphite are defective and one racket is randomly selected from the sample, find the probability that the racket is wood or defective.
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
Or means either one.
Table
Wood ;;;;;;;;;;; Graphite ;;; Total
Defective;;;;;; 9 ;;;;;;;;;;; 19;;; ;;28
non-D;;;;;; 91 ;;;;;;;;;;;;;;; 81;;;;;;;172
Total---------100--------------100-------200
Probability Wood is (100/200)
Probability defective is (28/200)
Probability BOTH is (9/200)
The answer is the sum of the first two minus the third, since we have double counted.
It is (100+28-9)/200=(119/200). It is the everything but graphite and non-defective.
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