The article “Stochastic Estimates of Exposure and Cancer Risk from Carbon Tetrachloride Released to the Air from the Rocky Flats Plant” (A. Rood, P. McGavran, et al., Risk Analysis, 2001:675–695) models the increase in the risk of cancer due to exposure to carbon tetrachloride as lognormal with μ = −15.65 and σ = 0.79.

a. Find the mean risk.

b. Find the median risk.

c. Find the standard deviation of the risk.

d. Find the 5th percentile.

e. Find the 95th percentile.