s a b
count 50.000000 50.000000 50.000000
mean 0.250000 0.200000 0.260000
std 0.178571 0.404061 0.443087
min 0.000000 0.000000 0.000000
25% 0.125000 0.000000 0.000000
50% 0.250000 0.000000 0.000000
75% 0.375000 0.000000 0.750000
max 0.500000 1.000000 1.000000