I've had one person try to help me solve this problem and they found V(X) to be (9^2)/12 = 6.75. I'm quite sure it's (6^2)/12 as the thetas cancel out leaving us with ((3+3)^2)/12 = 3. That would mean V(X-bar) is 3/75 = .04.
I'm not quite sure if the other two parts are right either.
Could somebody please glance over this quick? Thank you in advance.