Christmas tree light has an expected life of 190 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 180 hr and 200 hr. at least __ % (b) Suppose a large city uses 160,000 of these Christmas tree lights as part of its Christmas decorations. Estimate the number of lights that are likely to require replacement between 170 hr and 210 hr of use. __lights

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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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 190 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 180 hr and 200 hr.
at least __ %

(b) Suppose a large city uses 160,000 of these Christmas tree lights as part of its Christmas decorations. Estimate the number of lights that are likely to require replacement between 170 hr and 210 hr of use.
__lights
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