1 米】 0.6 4 0.3 2 0.1 0 10 20 30 40 5060 70 80 90 100 number of people1 0.9 ay 0.7 0.8 ples birthda 0.5 0.6 t two peop 0 3 0.4 y of at leas 0.2 0.3 probability 0 10 20 30 40 50 60 70 80 90 100 0 0.1 0 10 20 30 40 50 60 70 80 90 100 number of people