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 10,000 hours? equation editor Equation Editor %   (b) What is the sample standard deviation of the mean lifespan of 64 randomly chosen lightbulbs? equation editor Equation Editor (round to the nearest integer)   (c) What is the probability that the mean lifespan of 64 randomly chosen light bulbs falls between 8875 hours and 9125 hours? equation editor Equation Editor %

MATLAB: An Introduction with Applications
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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 10,000 hours?
equation editor
Equation Editor
%
 
(b) What is the sample standard deviation of the mean lifespan of 64 randomly chosen lightbulbs?
equation editor
Equation Editor
(round to the nearest integer)
 
(c) What is the probability that the mean lifespan of 64 randomly chosen light bulbs falls between 8875 hours and 9125 hours?
equation editor
Equation Editor
%
 
(d) Would you expect the mean lifespan of 64 randomly chosen light bulbs to be greater than 10,000 hours?
 
Yes
No

 

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