A sample of 100 wood and 100 graphite tennis rackets are taken from the warehouse. If 5 wood and 10 graphite are defective and one racket is randomly selected from the sample, find the probability that the racket is wood or defective.
2007-02-19 22:49:47 · 4 answers · asked by pooh 1 in Science & Mathematics ➔ Mathematics
The odds of randomly picking up a wooden racket are 100/200 or 1/2 or 0.5 (there are 100 wooden rackets among 200 rackets). The odds of picking up a defective racket are 15/200 or 3/40 or 0.075 (since there are 15 defective rackets among 200 rackets).
The probability that the randomly picked racket is wooden OR defective is:
0.5 + 0.075 = 0.575 or 57.5% or 23/40
2007-02-19 23:34:33 · answer #1 · answered by Dan Lobos 2 · 0⤊ 0⤋
200 total rackets.
100 are wood.
Of those not wood, 10 are defective.
(100+10)/200 = .55 = 55%
2007-02-20 06:58:19 · answer #2 · answered by Doc Occam 7 · 1⤊ 0⤋
there are 110 rackets which are wood or defective and 200 rackets altogether so
110/200
11/20
2007-02-20 07:53:18 · answer #3 · answered by adriantheace 4 · 0⤊ 0⤋
p(wood) = 0.5
p(defective)=15/200
2007-02-20 06:56:15 · answer #4 · answered by gjmb1960 7 · 0⤊ 0⤋