Question

A Christmas tree light has an expected life of 220 hr and a standard deviation of...

A Christmas tree light has an expected life of 220 hr and a standard deviation of 2 hr.

(a) Find a bound on the probability that one of these Christmas tree lights will require replacement between 210 hr and 230 hr.

(b) Suppose a large city uses 110,000 of these Christmas tree lights as part of its Christmas decorations. Estimate the number of lights that are likely to require replacement between 200 hr and 240 hr of use.

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Answer #1

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