Question: 3. If X is a discrete random variable with possible values {1, 2, 3, 4} and corresponding probabilities {0.1, 0.2, 0.3, 0.4}, calculate the variance

3. If X is a discrete random variable with possible values {1, 2, 3, 4} and corresponding probabilities {0.1, 0.2, 0.3, 0.4}, calculate the variance of X5 6| 4. Consider two random variables X and Y with joint distribution function given by

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