For process 5, Yt = mu + et - et-1
I use equation 3.2.3, I got result of 2/2500 But when I tried to do some simplification like exercise 3.2 on Page 50, I got Var(~Y)=1/2500Var[(50.u + e50)], which gave me 1/2500 as result.
Im very confused and didnt see where I went wrong.
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