Question 895841
A box contains 25 transistors, of which 4 are known to be bad. A transistor is selected at random and tested.
 a) What is the probability that it is bad? 4/25
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 b) If the first transistor tests bad what is the probability that a second transistor selected  at random will also be bad? 3/24 = 1/8
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 c) If the first transistor tested is good, what is the probability that the second transistor selected at random will be bad? 4/24
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Cheers,
Stan H.
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