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Problem: a homeowner has just installed 20 light bulbs in a new home. Suppose that each...

Problem: a homeowner has just installed 20 light bulbs in a new home. Suppose that each has a probability 0.2 of functioning more than three months. What is the probability that at least five of these function more than three months? What is the average number of bulbs the homeowner has to replace in three months?

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