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並前往https://www.stat.auckland.ac.nz/~fewster/325/notes/ch3.pdf

Chapter 3: Expectation and Variance

Find the sample variance of X (should be close to var(X)):. > var(x). [1] 12624.47. > > # Check the formula for E(X):. > 25 * (1 - 0.2) / 0.2.

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