Question
The life of a semiconductor laser at a constant power is normally distributed with a mean of 7000 hours and a standard deviation of 600
The life of a semiconductor laser at a constant power is normally distributed with a mean of 7000 hours and a standard deviation of 600 hours.
a. What is the probability that a laser fails before 5000 hours?
b. What is the life in hours that 95% of the lasers exceed?
c. If 3lasers are used in a product and they are assumed to fail independently, what is the probability that all three are still operating after 7000 hours?
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PX 5000 Normal Distribution u 7000 o 600 X 5000 ...
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Statistics For Business And Economics
Authors: Paul Newbold, William Carlson, Betty Thorne
8th Edition
0132745658, 978-0132745659
