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How would I answer this? Find the standard deviation of the random variable X. X 31 19 20 50 0 P(X = x) 0.3 0.2

How would I answer this?

Find the standard deviation of the random variable X. X 31 19 20 50 0 P(X = x) 0.3 0.2 0.2 0.3 (Round the final answer to the nearest tenth as needed. Round all intermediate values to the nearest thousandth as needed.)

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