Let E[X(Y-1)] = 10, E[X(Y+1)] = 20, V(X) = 8, V(Y) = 12 and V(X+Y) = 30. Then E(Y) = O 1 O 14/5 O 12/5 * The area under the curve of a chi square distribution ' (13) between 0 and is 0.3, then Xa is...

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Extracted text: Let E[X(Y-1)] = 10, E[X(Y+1)] = 20, V(X) = 8, V(Y) = 12 and V(X+Y) = 30. Then E(Y) = O 1 O 14/5 O 12/5 * The area under the curve of a chi square distribution ' (13) between 0 and is 0.3, then Xa is equal to: 15.352 15.119 O 10.117 O 9.926