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12. A random variable has range x1, x2, and x3 all with equal probabilities. What is...

12. A random variable has range x1, x2, and x3 all with equal probabilities. What is E(X)? 13. A random variable X has range x1, ..., xn all with equal probabilities. What is E(X)? 14. What is the expected value when we roll a die?

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