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 75th percentile.