Question

某人先后抛掷两枚一模一样的骰子,若用§表示先后抛掷两枚骰子点数之差的绝对值.求§的分布列和期望

Answer 1

p(0)=6*1/36=1/6

p(1)=5*2/36=5/18

p(2)=4*2/36=2/9

p(3)=3*2/36=1/6

p(4)=2*2/36=1/9

p(5)=1*2/36=1/18

E(s)=0*6/36+1*10/36+2*8/36+3*6/36+4*4/36+5*2/36=35/18