A pen company averages 1.2 defective pens per carton produced (200 pens). The number of defects per carton is Poisson distributed.
a. What is the probability of selecting a carton and finding two defective pens?
b. What is the probability of finding nine or more defective pens in a carton?
c. Suppose a purchaser of these pens will quit buying from the company if a carton contains more than three defective pens.
What is the probability that a carton contains more than three defective pens?
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