DSE 2006 Stats doubt

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Re: DSE 2006 Stats doubt

X1~N(u,16)
X2~N(u,16)

Var[2(X1-X2)]= 4Var(X1) + 4Var(X2) + 2(2)(-2)cov(X1,X2)
=4*16 +4*16 -8*0
=128

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