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Pradi
Answers (1)
not so sure, what do you think about this reasoning: B) Cov(X,Y)= ? if Heads with p=1/2 (fair coin): Cov(X,Y) = E[XY] - E[X]E[Y] = E[XY] = E[X^2] = var(X) -(E[X])^2 = var(X) = 1 if Tails with p=1/2: Cov(X,Y) = E[-X^2] = - E[X^2] = -var(X) = - 1 Cov(X,Y)=
