求一道很簡單的數學概率題!英文稍好的進! 現在是10月5日上午9點36我希望到晚上六點前有結果!In the casino game called high-low,there are three possiblebets.Assumethat $1 is the size of the bet .A pair of fair 6-sided dice is rolled and their sum iscalculated.Ifyou bet Low,you win $1 if the sum of the dice is {2,3,4,5,6}.if you bet high,you win $1 if the sum of the dice is {8,9,10,11,12} if you bet on {7} you win $4 if a sum of 7 isrolled.Otherwiseyou lose on each of the threebets.Inall three cases,your origional dollar is returned to you if youwin.Findthe expected value of the game to the better of thebet of high.

求一道很簡單的數學概率題!英文稍好的進! 現在是10月5日上午9點36我希望到晚上六點前有結果!In the casino game called high-low,there are three possiblebets.Assumethat $1 is the size of the bet .A pair of fair 6-sided dice is rolled and their sum iscalculated.Ifyou bet Low,you win $1 if the sum of the dice is {2,3,4,5,6}.if you bet high,you win $1 if the sum of the dice is {8,9,10,11,12} if you bet on {7} you win $4 if a sum of 7 isrolled.Otherwiseyou lose on each of the threebets.Inall three cases,your origional dollar is returned to you if youwin.Findthe expected value of the game to the better of thebet of high.


題目:在賭場遊戲叫高有低,有三種可能的賭注.假設1美元的賭注的大小.阿對公平6面骰子是卷和他們的總和計算.如果你打賭低,你贏1美元,如果骰子的總和為(2,3,4,5,6).如果你打賭高,你贏1美元,如果骰子的總和(8,9,10,…



有80個球分別標記1號.2號3號.79號80號,把它們放到一個罎子中(我們把1~40這40個命名為小號,把41~80這40個命名為大號)用手去摸出20個球出來
已知也許摸出的大號比小號多的概率與摸出小號比大號多的概率是相等的一樣的
問1:摸出同樣多的概率是8分之幾?%分之幾?(也就是大號摸出10個小號摸出10個的概率)
問2:
摸20個球之後又全部放進去從新再次摸20個球出來這樣連續摸3次請問摸出一樣多的概率是8分之幾?%分之幾?(摸3次只需要摸出1次以上就算)也就是摸3次摸出一樣多的幾率是多少
因為對我來說很重


①同樣多的概率為C(40,10)C(40,10)/C(80,20)=20.32%
大號多於小號和小號多於大號的概率都是(1-20.32%)/2=39.84%
②三次至少摸出一次一樣多的概率為
1-(1-20.32%)^3==49.41%



小周、小李、小方的薪水比數是3:1:5,小李薪水是300元,則小周與小方的薪水分別是多少?
感謝樓下這麼多朋友的回答,
225375
我也百思不得其解


小李的薪水是300,則:
3:1:5=
小周:小李:小方=
3*小李薪水:1*小李:5*小李
=900:300:1500
答案也有錯的時候.要麼就是小李的薪水是75



小學四年級數學簡便運算請詳細解答,謝謝!(14 21:8:40)
76*69+76
 ;
26*14-26*9-26


76*69+76
=76*69+76*1
=76*(69+1)
=5320
26*14-26*9-26
=26(14-9-1)
=26*4
=104