排序如下30,32,39,40,41,43,44,46,54平均數 A=(30+32+39+40+41+43+44+46+54)/9=41中位數 B=41
排序後 30,32,39,40,41,43,44,46,54
平均數X = (30+32+39+40+41+43+44+46+54)/9 =41
中位數Me=X(5)=41