A.66.97% B.105.03% C.93.14% D.92.78%
A.17.6% B.85% C.115% D.117.6%
A.隨總體范圍增大而增大 B.隨總體范圍增大而縮小 C.隨總體范圍縮小而增大 D.與總體范圍大小無關(guān)