The lifetime of an LED bulb follows a lognormal distribution. Suppose that the mean andstandard deviation of the lifetime are 28,000 hours and 40,000 hours, respectively.a. What are the parameters and w of the lognormal distribution?b. What is the probability that the lifetime of a bulb exceeds 30,000 hours?c. Determine the lifetime that is exceeded by 95% of the bulbs.

From given data we have : μ=28000σ=40000

Answered: The lifetime of an LED bulb follows a…

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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