Question: A problem in a textbook states that the covariance matrix for x 1 and x 2 is The entry marked by ? is smudged, but

A problem in a textbook states that the covariance matrix for x₁ and x₂ is 24 4 ? The entry marked by ? is smudged, but you are certain it is either a 7 or a 9. Which must it be?

24 4 ?

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