SOLUTION: The quality control manager at a light bulb factory needs to estimate the mean life of a large shipment of light bulbs. The standard deviation is 108 hours. A random sample of 81

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Question 1165633: The quality control manager at a light bulb factory needs to estimate the mean life of a large shipment of light bulbs. The standard deviation is 108 hours. A random sample of 81 light bulbs indicated a sample mean life of 400 hours. Complete parts​ (a) through​ (d) below.
Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
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The quality control manager at a light bulb factory needs to estimate the mean life of a large shipment of light bulbs.
The standard deviation is 108 hours. A random sample of 81 light bulbs indicated a sample mean life of 400 hours.
Complete parts​ (a) through​ (d) below.
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There are no parts (a) through (d) in the post.

They all were lost due to the carelessness of the person or people who prepared this post.

It is a typical case when they send a message without reading it and without looking in it.