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2. Which of the following statements is true? A. The average deviation of x1, x2, ..... ,x from the mean? must be zero. The mean

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2. Which of the following statements is true? A. The average deviation of x1, x2, ..... ,x from the mean? must be zero. The mean squared deviation of II ,xz, ..... ,x,I rm the mam? is always zero. B. C. We use at2 to denote the sample variance. D. The sample size n is always larger than 30

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