Show that the following function satisfies the properties of a joint probability mass function. y fxr (x, y) 1.0 1 1/4 1.5 2 1/8 1.5 3 1/4 2.5 4 1/4 3.0 5 1/8 Determine P[X < 2.5, Y < 4] O 1/8 О 38 O 5/8 O 7/8

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