1+2+3....+49)/6=150.正態..之頂.P(21)=1/C(49,3)=0.000000072. 5.5SGM.(猜的) 150-21=129,
SGM=129/5.5=23.45, 1/23.45=.0426. .0426/2=.021,查表,.008, P(150)=.016 .016*C(49,6)=22萬.
1+2+3....+49)/6=150.正態..之頂.P(21)=1/C(49,3)=0.000000072. 5.5SGM.(猜的) 150-21=129,
SGM=129/5.5=23.45, 1/23.45=.0426. .0426/2=.021,查表,.008, P(150)=.016 .016*C(49,6)=22萬.
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回複:近似解有,我約數是22萬.請您用CP算一下.
-萬斤油-
♂
(5000 bytes)
()
01/30/2013 postreply
05:10:33
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謝謝,我的表太粗,誤差大,因知您能算精值,我才敢做.此類問題一般與彩票有關.怕誤導人.
-jinjing-
♀
(40 bytes)
()
01/30/2013 postreply
06:53:18
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謝謝, 你好厲害呀...
-老靴-
♂
(0 bytes)
()
02/25/2013 postreply
07:35:35
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