[econometrics] Help finding variance please?

Posted on 2016-10-12 18:38:00 in Math by KEVIN

_______D=0____D=1 
R=1____.2______.02 
R=0___.02______.76 

Excuse my poor formatting but its a table, 

I was able to find the covariance using the formula but for the life of me I just cant figure out the correlation because I need the variances of R and D. The answer guide says 
Var(R) = .615 
Var(D) = .111 
but I just cant figure out how it got those answers. 

Any help would be greatly appreciated

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