The lifespan of EEL light bulbs is a random variable obeying a normal law. Lifetime average of these bulbs is 3,000 hours and the standard deviation is 200 hours. Find the probability that a light bulb lasts over 3,500 hours.

The lifespan of EEL light bulbs is a random variable obeying a normal law. Lifetime average of these bulbs is 3,000 hours and the standard deviation is 200 hours. Find the probability that a light bulb lasts over 3,500 hours.

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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Question

The lifespan of EEL light bulbs is a random variable obeying a normal law. Lifetime
average of these bulbs is 3,000 hours and the standard deviation
is 200 hours. Find the probability that a light bulb
lasts over 3,500 hours.

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Expert Solution

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The lifespan of EEL light bulbs is a random variable obeying a normal law. The lifetime
average of these bulbs is 3,000 hours and the standard deviation
is 200 hours.

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