1. The problem statement, all variables and given/known data 2. Relevant equations Cf=0.0577(μ/xρUm)0.2 3. The attempt at a solution I've managed to do parts a) and b), however I don't believe my attempt at the first part is correct as I am using a different Cf than the value used in the mark scheme. The expression I made for the first part is, 0.0577(μ/ρUm)0.2[x0.8], with limits L and 0. This gave me a CDf of 0.00421, but it should be 0.00263.