A manufacturer of compact fluorescent light bulbs advertises that the distribution of the lifespans of these light bulbs is nearly normal with a mean of 9,000 hours and a standard deviation of 1,000 hours. (a) What is the probability that a randomly chosen light bulb lasts more than 10,500 hours? _______________ (please round to four decimal places) (b) Describe the distribution of the mean lifespan of 15 light bulbs. ( )right skewed ( )approximately normal with μ = 9000 and σ = 1000 ( )left skewed ( )approximately normal with μ = 9000 and σ=1000√15σ=100015 (c) What is the probability that the mean lifespan of 15 randomly chosen light bulbs is more than 10,500 hours? __________________ (please round to four decimal places)
A manufacturer of compact fluorescent light bulbs advertises that the distribution of the lifespans of these light bulbs is nearly normal with a mean of 9,000 hours and a standard deviation of 1,000 hours. (a) What is the probability that a randomly chosen light bulb lasts more than 10,500 hours? _______________ (please round to four decimal places) (b) Describe the distribution of the mean lifespan of 15 light bulbs. ( )right skewed ( )approximately normal with μ = 9000 and σ = 1000 ( )left skewed ( )approximately normal with μ = 9000 and σ=1000√15σ=100015 (c) What is the probability that the mean lifespan of 15 randomly chosen light bulbs is more than 10,500 hours? __________________ (please round to four decimal places)
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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4.40 CFLBs: A manufacturer of compact fluorescent light bulbs advertises that the distribution of the lifespans of these light bulbs is nearly normal with a
(a) What is the
(please round to four decimal places)
(b) Describe the distribution of the mean lifespan of 15 light bulbs.
( )right skewed
( )approximately normal with μ = 9000 and σ = 1000
( )left skewed
( )approximately normal with μ = 9000 and σ=1000√15σ=100015
(please round to four decimal places)
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