B(5,2;1/30)=C(5,2)*(1/30)^2*(1-1/30)^3=0.01
Happy birthday to you,my daughter's also in April.Summer is parent' happy days,So...四月出生的特別多.
回複:我們班四月出生的特別多,占1/5。全班35人,
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覺得應該比這個數字要大,大很多。
-金屬米-
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04/23/2010 postreply
10:49:28
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0.27,B is so,so.In fact,I can't do fast as young man
-jinjing-
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04/23/2010 postreply
13:10:35
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Please read my answer ,chang 5 to 7,ha ,too careless
-jinjing-
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04/23/2010 postreply
13:25:14
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Sorry ,It shout be 0.3, I for get *30
-jinjing-
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04/23/2010 postreply
10:58:15
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wrong
-jinjing-
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04/23/2010 postreply
15:20:09
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29.6266667%
-曉仁悟-
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05/05/2010 postreply
20:02:22
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53.1%
-曉仁悟-
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05/05/2010 postreply
20:28:19
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夏天精子較為活躍
-吹縐一池春水-
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08/12/2010 postreply
12:57:21