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Q1. Given P(X = 20, Y = 0) = 0.4, and P(X = 30, Y = 50) = 0.6, then COV(XY) is:
A) 125.00.
B) 25.00.
C) 120.00.
Q2. 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) 24.0.
B) -12.0.
C) 6.0.
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发表于 2009-1-9 09:54
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