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4. (10 points) A dataset contains 5 observations {X1 3,X2 6,X3 9,X4 12,X5 15}. Here 2?: 21:1 X3 = 495. Compute the variance of the

4. (10 points) A dataset contains 5 observations {X1 3,X2 6,X3 9,X4 12,X5 15}. Here 2?: 21:1 X3 = 495. Compute the variance of the observations. 1

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