I tried working on it and got the E(Xn) = 2n and Var(Xn) = 4n, and P(|Xn-2n| > .01) < (4n/(.01)^2)(1/n)= 40000.

Then i don't know what to do here. And i checked online of how to do this. Can you please help me how to solve this problem. Thank you so much for your help.