1. The problem statement, all variables and given/known data Bearing capacity of soil varies between 6 and 15 kips/sq.ft. If probability density within this range is given as f(x)=1/2.7 * (1- x/15), 6 ≤ u ≤ 15 =0 otherwise Find E(X) and E(X^2) 2. Relevant equations E(x) should be ∫x*f(x) dx E(x^2) should be ∫x^2*f(x) dx 3. The attempt at a solution E(x) ends up being 9 when I plug it in, but the answer sheet says either 9.55 or 9 * 55 (his decimals can look like multiplication dots) E(x^2) ends up being 85.5, but the answer sheet says either 230.81 or 230 * 81. I feel like it should be the * ones, because 9 and 81 are part of them, but I have no clue why, unless my equations are wrong.