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An office copier has paper jams on 80% of all copies when not smacked. However, there...

An office copier has paper jams on 80% of all copies when not smacked. However, there is a 10% chance that a disgruntled employee smacked it with a baseball bat, in which case the machine will paper jam on 99% of all copies.

a) Suppose that a copy made by this copier experienced a paper jam. What is the probability that this machine was smacked?

b) A random sample of 20 copies was made. Suppose that 19 out of the 20 copies experienced a paper jam. What is the probability that this machine was smacked?

Math   Statistics-And-Probability   
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