y P(Y=y) 1 0.5000000000 2 0.2500000000 3 0.1250000000 4 0.0625000000 5 0.0312500000 6 0.0156250000 7 0.0078125000 8 0.0039062500 9 0.0019531250 10 0.0009765625 11 0.0009765625