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5.2 Correlated sample. Find the mean and variance of the sample mean of a correlated sample: {x1, 2, 23}, where x1 and x2 have correlation

5.2 Correlated sample. Find the mean and variance of the sample mean of a correlated sample: {x1, 2, 23}, where x1 and x2 have correlation coefficient p12 = 0.5, x3 is independent of x1 and x2, 02 = 02 = 0 .2 2 2

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