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X~U(0,3)
4t^2+4Xt+X +2 =0
△≥0
(4X)^2 -4(4)(X+2) ≥0
-32X≥0
X≤0
P(4t^2+4Xt+X +2 =0 ; t有实根)
=P(X≤0)
=0
4t^2+4Xt+X +2 =0
△≥0
(4X)^2 -4(4)(X+2) ≥0
-32X≥0
X≤0
P(4t^2+4Xt+X +2 =0 ; t有实根)
=P(X≤0)
=0
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(1) P(X(10C5) = 1/252 P(X=6) = (5C4)/(10C5) = 5/252 P(X=7) = (6C4)/(10C5) = 15/252 P(X=8) = (7C4)/(10C5) = 35/252 P(X=9) = (8C4)/(10C5) = 70/252 P(X=10) = (9C4)/(10C5) = 126/252 P(X>10)=0 (2) P(Y P(X=10) = 126/252 P(Y=2) = P(X=9) = 70/252 P(Y=3) = P(X=8) = 35/252 P(Y=4) = P(X=7) = 15/252 P(Y=5) = P(X=6) = 5/252 P(Y=6) = P(X=5) = 1/252 P(Y>6)=0
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