promotion image of download ymail app
Promoted
kkjs 發問於 科學及數學數學 · 1 十年前

Expected value of an experiment

查左字典完全睇唔明

For a taial with n possible outcomes, if the probabilities of the occurences of these outcomes are P1,P2,....,Pn,respectively,and the corresponding values obtained for the outcomes are respectively A1,A2,...,An,then the expected value of the trial is P1A1+P2A2+...+PnAn

邊個可以幫我?

暑假就完!

更新:

唔係taial 係trial

1 個解答

評分
  • 1 十年前
    最愛解答

    對於n個測試的可能結果,如果那些結果的發生的概率分別為P1,P2,...Pn,而那些結果對應的值為A1,A2,....An,那麼,該實驗的期望值為 P1A1+P2A2+...+PnAn。

    2008-08-19 12:33:03 補充:

    例如:

    在擲一骰子,擲中一的概率為0.1,擲中二的概率為0.2,擲中三的概率為0.3,擲中四的概率為0.2,擲中五的概率為0.1,擲中六的概率為0.1

    期望值

    =(1)(0.1)+2*0.2+3*0.3+4*0.2+5*0.1+6*0.1

    =3.3

    • Commenter avatar登入以回覆解答
還有問題嗎?立即提問即可得到解答。