SOLUTION: in a box of 10 electrical parts , 2 are defective. (a) if you choose one part at random from the box, what is the probability that is not defective? (b) if you choose two parts

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Question 471532: in a box of 10 electrical parts , 2 are defective.
(a) if you choose one part at random from the box, what is the probability that is not defective?
(b) if you choose two parts at random from the box ,without replacement ,what is the probability that both are a defective?

Answer by Tatiana_Stebko(1539) About Me  (Show Source):
You can put this solution on YOUR website!
in a box of 10 electrical parts , 2 are defective, so 10-2=8 are not defective
(a) p=8%2F10=0.8
(b)p=%282%2F10%29%2A%281%2F9%29=1%2F45