In the manufacturing of computer memory chips, company A produces one defective chip for every nine good chips. Let X be time to failure (in months) of chips. It is known that X is an exponential r.v. with parameter 1 = f for a defective chip and A = with a good chip. Find the probability that a chip pur- chased randomly will fail before (a) six months of use; and (b) one year of use
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