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The mean and standard deviation of the lifetime of a semiconductor laser (in hours) are equal...

The mean and standard deviation of the lifetime of a semiconductor laser (in hours) are equal to 3380 and 1800 hours, respectively. Find the lifetime exceeded by 99% of all such lasers assuming the lifetime follows a lognormal distribution. Hint: it is easier to find the parameter ω first making use of the relation Std(X) = E(X) √ e ω2 − 1.

Math   Statistics-And-Probability   
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