Question 916566: A box contains 50 computer chips of which 8 are known to be bad. A chip
is selected at random and tested.
(a) What is the probability that it is bad?
(b) If a test on the first chip shows that it is bad, what is the probability that
a second chip selected at random will also be bad, assuming the tested
chip is not put back into the box?
(c) If the first chip tests good, what is the probability that a second chip
selected at random will be bad, assuming the tested chip is not put
back into the box?
Answer by ewatrrr(24785)   (Show Source):
You can put this solution on YOUR website! 50 Chips, 8 bad, 42 good
a. one drawn..P(bad) = 8/50 = 4/25
b. Second drawn- first not replaced....P(bad| 1st bad) = 7/49 = 1/7
c. Second drawn- first not replaced...P(bad|1st good) = 8/49
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