急!!一題跟機率有關的數學證明

👨🏻‍🏫 學術台數學

[匿名]

2013-01-07 11:23 pm

http://img834.imageshack.us/img834/5199/55285956.png

請問誰會證明這題??

回答 (2)

hung

2013-01-08 1:03 am

✔ 最佳答案

圖片參考：http://imgcld.yimg.com/8/n/HA00482599/o/20130107170303.jpg
--------------------------------------------------------

2013-01-07 17:22:51 補充：
If you are interested why the limit I stated in line 4 is zero , you may have a look in :

http://imageshack.us/f/194/proofhq.png/

👍 0 👎 0

用戶9112

2013-01-08 4:33 am

The integral can be evaluated directly by letting t= x/β so E(x)=βГ(α+1)/Г(α) =αβ
E(x^2 )=β^2 Г(α+2)/Г(α) =α(α+1) β^2

👍 0 👎 0