Suppose X₁ and X₂ are i.r.v. and come from gamma(2a, 2). Show that U = X₁ + X₂ comes from gamma(4a, 2). Using software R, sample from X₁, X₂ and U and confirm that U = X₁ + X2, where U~ gamma(4a, 2) and gamma(2a, 2) and X₂ ~ gamma(2a, 2). Use values a = 2 and λ = 3. X₁

Then show the classes that you used for display

can you redo this? 27 is incorrect.

I typed this in for an assignment online but it still comes out as incorrect. The answer on my assignment has to be decimal form so I put  1.25 and it's not right