Question: Random variable X has a variance of 20 and Y has a variance of 5, their correlation coefficient is 0.7. Then, the variance of

Random variable X has a variance of 20 and Y has a

Random variable X has a variance of 20 and Y has a variance of 5, their correlation coefficient is 0.7. Then, the variance of their difference is O a. 13 O b. 9 O c. 15 O d. 11

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