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If the coefficient of correlation r = 0 .80, the variances of X and Y are 2 and 5, respectively. Then Cov( X , Y

If the coefficient of correlationr= 0 .80, the variances ofXandYare 2 and 5, respectively. Then Cov(X,Y) must be...

a) 3.57

b) .8

c) 2.53

d) 8

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