3-60. The lifetime of a semiconductor laser has a lognormal distribution, and it is known that the mean and standard devi- ation of lifetime are 10,000 and 20,000 hours, respectively. (a) Calculate the parameters of the lognormal distribution. (b) Determine the probability that a lifetime exceeds 10,000 hours. (c) Determine the lifetime that is exceeded by 90% of lasers.
3-60. The lifetime of a semiconductor laser has a lognormal distribution, and it is known that the mean and standard devi- ation of lifetime are 10,000 and 20,000 hours, respectively. (a) Calculate the parameters of the lognormal distribution. (b) Determine the probability that a lifetime exceeds 10,000 hours. (c) Determine the lifetime that is exceeded by 90% of lasers.
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Use the Normal Distribution transformation in your work
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