A manufacturer of light bulbs finds that one light bulb model has a mean life span of 1,025 h with a standard deviation of 87 h. What percent of these light bulbs will last a. at least 950 h? b. between 800 and 900 h?
A manufacturer of light bulbs finds that one light bulb model has a mean life span of 1,025 h with a standard deviation of 87 h. What percent of these light bulbs will last a. at least 950 h? b. between 800 and 900 h?
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 manufacturer of light bulbs finds that one light bulb model has a mean life span of
1,025 h with a standard deviation of 87 h. What percent of these light bulbs will last
a. at least 950 h?
b. between 800 and 900 h?
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