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%).
Big Ideas Math A Bridge To Success Algebra 1: Student Edition 2015
1st Edition
ISBN:9781680331141
Author:HOUGHTON MIFFLIN HARCOURT
Publisher:HOUGHTON MIFFLIN HARCOURT
Chapter9: Solving Quadratic Functions
Section: Chapter Questions
Problem 4CA
Related questions
Question
A certain manufacturer makes
400
W light bulbs. Assume that these light bulbs have lifetimes that are
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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