A. Use Equation (4.13) to write a formula for the median ,m of the lognormal distribution. What is the median for the load distribution of Exercise 79? b. Recalling that za is our notation for the 100(1 2 a) percentile of the standard normal distribution, write an expression for the 100(1 2 a) percentile of the lognormal distribution. In Exercise 79, what value will load exceed only 1% of the time?