A Christmas tree light has an expected life of 100 hr and a standard deviation of 3 hr.
Estimate the probability that one of these Christmas tree lights will last between 94 and 106 hr.
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Suppose 170,000 of these Christmas tree lights are used by a large city as part of its Christmas decorations. Estimate the number of lights that will require replacement between 70 and 130 hr of use.
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