任选一件次品率为0.3,正品率为0.7;则被接受有三种情况:两件正品,一件正品一件次品(次品误判),两件次品(两件误判)
0.7*0.7*0.99*0.99+0.7*0.99*0.3*0.05+0.3*0.3*0.05*0.05=0.480249+0.010395+0.000225=0.491094
任选一件次品率为0.3,正品率为0.7;则被接受有三种情况:两件正品,一件正品一件次品(次品误判),两件次品(两件误判)
0.7*0.7*0.99*0.99+0.7*0.99*0.3*0.05+0.3*0.3*0.05*0.05=0.480249+0.010395+0.000225=0.491094