A certain manufacturer makes 400 W light bulbs. Assume that these light bulbs have lifetimes that are normally distributed with a mean lifetime of 392 hours and a standard deviation of 64 hours. Use this table or the ALEKS calculator to find the percentage of light bulbs with lifetimes shorter than 440 hours. For your intermediate computations, use four or more decimal places. Give your final answer to two decimal places (for example 98.23%).
A certain manufacturer makes 400 W light bulbs. Assume that these light bulbs have lifetimes that are normally distributed with a mean lifetime of 392 hours and a standard deviation of 64 hours. Use this table or the ALEKS calculator to find the percentage of light bulbs with lifetimes shorter than 440 hours. For your intermediate computations, use four or more decimal places. Give your final answer to two decimal places (for example 98.23%).
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Question
A certain manufacturer makes
400
W light bulbs. Assume that these light bulbs have lifetimes that are normally distributed with a mean lifetime of
392
hours and a standard deviation of
64 hours.
Use this table or the ALEKS calculator to find the percentage of light bulbs with lifetimes shorter than 440 hours. For your intermediate computations, use four or more decimal places. Give your final answer to two decimal places (for example 98.23%).
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