The joint distribution of the random variable X and Y is given in the following table: 3 Y 1 1 1 16 16 16 1 1 16 1 1 1 16 8. 16 4 a 16 If P(X + Y > 5) = then a and b are equal to: O a=1/8 and b=3/8 O a=3/8 and b=1/16 O a=1/8 and b=1/16 O a=1/16 and b=1/8 2.

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