A Christmas Tree Light Has an Expected Life of 200

question 37

Multiple Choice

A Christmas tree light has an expected life of 200 hr and a standard deviation of 3 hr. Suppose 190,000 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 185 and 215 hr of use.

• A) 182,800
• B) 7,600
• C) 179,100
• D) 7,000
• E) 182,400

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