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Consider the discrete random variables X1 and X2 with joint probability function (PF):
What is the variance of X1 ?
What is the value of cov(3X1,4X2) ?

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Consider the discrete random variables X1 and X2 with joint probabili.pdf

  • 1. Consider the discrete random variables X1 and X2 with joint probability function (PF): What is the variance of X1 ? What is the value of cov(3X1,4X2) ?