a) The probability that brand A bulbs will have a mean lifetime that is at least 160 hours. b) The probability that brand A bulbs will have a mean lifetime that is at least 250 hours more than brand B bulbs?
a) The probability that brand A bulbs will have a mean lifetime that is at least 160 hours. b) The probability that brand A bulbs will have a mean lifetime that is at least 250 hours more than brand B bulbs?
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:The electric light bulbs of manufacturer A have a mean lifetime of 1400 hours, with a standard
deviation of 200 hours. While electric light bulbs from manufacturer B have a mean lifetime of
1200 hours, with a standard deviation of 100 hours. If random samples of 150 bulbs of each
brand are tested, find:
a) The probability that brand A bulbs will have a mean lifetime that is at least 160 hours.
b) The probability that brand A bulbs will have a mean lifetime that is at least 250 hours
more than brand B bulbs?
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