The lifetime of 1000 light bulbs is known to be naturally distributed with a mean of 100
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Question:
The lifetime of 1000 light bulbs is known to be naturally distributed with a mean of 100 hours and standard deviation of 8 hours. How many bulbs picked at random would have a lifetime of
a. Less than 80 hours
b. Between 110 and 120 hours
c. More than 124 hours
Related Book For
Statistics For Business And Economics
ISBN: 9780132745659
8th Edition
Authors: Paul Newbold, William Carlson, Betty Thorne
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