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PLEASE HELP 4. The following table displays the joint probability distribution of two random variables X and Y. Y 1 2 4 1 0.25 0.2

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4. The following table displays the joint probability distribution of two random variables X and Y. Y 1 2 4 1 0.25 0.2 0.05 X 3 0.05 0.05 0.1 5 0.1 0.05 0.15 (a) Find the expected value of Y. [2 marks] (b) Find the expected value of X. [2 marks] (c) Find the variance of Y. [3 marks] (d) Find the variance of X. [3 marks] (e) Are X and Y statistically independence? Explain. [3 marks]

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