80.

a. Use Equation (4.13) to write a formula for the median

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of the lognormal distribution. What is the median for the power distribution of Exercise 79?

b. Recalling that z is our notation for the 100(1  ) percentile of the standard normal distribution, write an expression for the 100(1  ) percentile of the lognormal distribution. In Exercise 79, what value will received power exceed only 5% of the time?