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(X,Y) , X, Y - . .
X | Y | ||||
y1 | y2 | .. | ym | PX | |
x1 | p11 | p12 | p1m | pX1 | |
x2 | p21 | p22 | p2m | pX2 | |
. | |||||
xn | pn1 | pn2 | pnm | pXn | |
PY | pY1 | pY2 | pYm |
pnm = , pYm = = p1m+ p2m ++pnm,
pXn = pn1 + pn2 + +pnm.
, pij (xi , yj) OX OY. x = xi, y pi1, pi2, pim ( pXi). y = yj, x p1j, p2j, pnj ( pYj). ( x x1 y y1) , ( x>xn, y>ym) 1. x > xn y pY1, pY2, pYm ( 1). y > ym, x pX1, pX2, pXn ( 1).
. . p, q = 1- p. Xi i . (X1, X2)= .
X | Y | ||
y1=0 | y2=1 | PX | |
x1=0 | q2 | qp | pX1=q |
x2=1 | pq | p2 | pX2=p |
PY | pY1=q | pY2=p |
. , {X<x,Y<y} - , (x>1, y>1) {X<x,Y<y} .
{X<x,Y<y} {X=0,Y=0}. F(x) = P{X=0,Y=0}= q2.
{X<x,Y<y} {X=0,Y=0} {X=0,Y=1}. F(x) =. P{X=0,Y=0}+ P{X=0,Y=1}= q2 + pq = q(p+q)=q., F(x) = P{X=0,Y=0}+ P{X=1,Y=0}= q2 + pq = q(p+q)=q
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