1. The problem statement, all variables and given/known data Let X denote a continous random variable with probability density function f(x) = kx3/15 for 1≤X≤2. Determine the value of the constant k. 2. Relevant equations I'm not sure if this is right but I think ∫kx3/15 dx=1 with the parameters being between 2 and 1, 3. The attempt at a solution So I did what I i showed in the relevant equations section. I got k = 4. When I plug 2 into the equation for X, my probability is greater than 1 so I know this isn't right. I'm not sure what else to do.