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 a tested chip is not put back into the box?