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.
• 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
• 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
• 謝謝, 你好厲害呀... -老靴- ♂ (0 bytes) () 02/25/2013 postreply 07:35:35
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