Binomial distributing (p+q)=∑fn 7-6 f r n-r 7 wm= af 7-7 War= pfBinomial distributing ( ) r n r r n r n n r n r n f c p q p q f − = = + =  , 1 , 7-7 7-6 n r s n r n r m n r W pf W qf , , , , = =  