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[ Last edited by jfili on 2009-6-10 at 09:44 ]
2Â¥2009-06-05 11:56:02
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X_1+X_2=2 with probability p^2,
X_1+X_2=3 with probability 2p(1-p),
X_1+X_2=4 with probability (1-p)^2.
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F(x)=0          µ± x<2,
F(x)=p^2      µ± 2\leq x<3,
F(x)=2p-p^2  µ± 3\leq x<4,
F(x)=1           µ± 4\leq x¡£
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