单项选择题
Use a stated rate of 9 percent compounded periodically to
answer the following three questions. Select the choice that is the closest to
the correct answer.Given P(X =2, Y= 10) =0.3, P(X=6, Y=2.5) =0.4, and P(X =10,Y=0)=0.3,
then Cov(XY) is:
A. -12.0.
B. 24.0.
C. 6.0.