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 First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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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.
 

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