The strength x of a certain material is such that its distribution is found by x = ey, where y is n(10, 1). find the cdf and pdf of x, and compute p(10, 000 < x < 20, 000). note: f(x) = p(x ≤ x) = p(ey ≤ x) = p(y ≤ ln x) so that the random variable x is said to have a lognormal distribution.