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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