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4. Find the expected value, standard deviation and variance for the data below. Prob Rx Ry 20% 9.00 9.65 30%-5.00 -4.00 25% 8.50 12.50

4. Find the expected value, standard deviation and variance for the data below. Prob Rx Ry 20% 9.00 9.65 30%-5.00 -4.00 25% 8.50 12.50 25% 8.00 9.57

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