90.

a. Use Equation (4.13) to write a formula for the median of the lognormal distribution. What is the median for the power distribution of Exercise 89?

b. Recalling that za is our notation for the 100(1a)

percentile of the standard normal distribution, write an expression for the 100(1 a) percentile of the lognormal distribution. In Exercise 89, what value will received power exceed only 5%

of the time?