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question1 can the mean absolute deviation ever be

Question1: Can the mean absolute deviation ever be negative? Why or why not?

Question2: Consider the sample of observations, x1, x2,…, xn, which has sample mean & sample variance s2. Assume that each observation is multiplied by a constant k so that the new observations are kx1, kx2,…, kxn. Calculate the mean & variance of the new observations.

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Mathematics: question1 can the mean absolute deviation ever be

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