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變異數與標準差
Jul 5th 2013, 17:12

知識問題|

發問者： Rr ( 初學者 5 級)
發問時間： 2013-07-06 01:12:48 ( 還有 22 小時發問到期 )
解答贈點： 10 ( 共有 0 人贊助 )
回答： 0 0

1.將編號1,2,3三個球隨意放入同樣編為1，2，3號的盒中（ 每盒一球），設隨機變數X為盒內的球之球號與盒號相同的個數，求：（1）E( X)=u=? (2)標準差b=? （3)p(u-b<x<u+b)=? (4)E(5X-2)
2.設X為一隨機變數，已知E(X)=15,V(X)=4,試求：（1）E(X+4)=? V(X+4)=? （2）E(2X)=? V(2X)=?（3）E(-3X+5)=?（4）E(X^2)=?

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