????12W????????????è??????????????????????????????????Щ?????????????????……??……??????????????……?????ο???……
?????????????????????????ú????????????????????????????X=???????? Y=??ε??????????
N?????
???????????????????=(N-1)/N*Y-(1/N)*(X-Y)
???磺???2??1??10W???????????16W????
??????????=(2-1)/2*10-(1/2)*(16-10)=2W
N??M??
?????????????ε?????????=(N-1)/N*Y-(1/N)*(X-Y)
?????ε?????????=(N-2)/(N-1)*Y-1/(N-1)*(X-Y)
???????
???磺???4??2??8W???????????16W????
?????ε????????=(4-1)/4*8-(1/4)*(16-8)=4W
?????ε????????=(3-1)/3*8-(1/3)*(16-8)=2.6W
?????????????????ε??????ε???????
???????????????С???????????????????????????????????????????……???????????????……
????????????????????????????????SO?????????????……??……
???????????è??????????????????????????????????????????????????????????ε???????
????????????????????????????????????????40407???????40407????????
