In Gombak district 2500 electric lamps are installed for street lighting. The lampscome from a different manufacturer and have a mean burning life of 1050 hours.We know from past experience that the distribution of burning lives approximatesa normal distribution. The 250th lamp fails after 819 hours. What is the standarddeviation of burning lives for this set of lamps?(e)

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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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