A s, () . ()/() , , . () = ()/(). N , NB - , . N , . N/NB , .
()=()() , . . (123)=(1)1(2)12(3)
, ()=(). .
- , ()=()(). ( )
.
1, 2,,n , ()=1(1)(1)+2()(2)++Hn()(n). .
. ( ). , .
.
p(AHi)=pHi(A)p(Hi)
p(HiA)=pA(Hi)p(A) ,
pHi(A)p(Hi)=pA(Hi)p(A) .
pA(Hi)= Hi(A)p(Hi).
1(1)(1)+2()(2)++Hn()(n)
.
, () , . , S={1, 2,} , (ÎS)=1. 1, 2, .
i=(=i) i- . i ≠ j =i = j . :
1 | 2 | ||
1 | 2 |
. F(x)=P(X<x).
F(x) 1, 2,, 1, 2,
- .
, , : ()=11+22++npn
. 1.. : ()=
2. : ()=()
|
|
3. . :
(1+2++n)=M(X1)+M(X2)++M(Xn)
4. . (. . , (1=1,n=an)=P(X1=a1)*(Xn=an).
-() . . D(X)=M(X-M(X))2.
s(). : D(X)=M(X2)-M(X)2
. 1. () D(X+C)=D(X)
2. - D(X)=2D(X)
3. D(X1++Xn)=D(X1)++ D(Xn)
, 0: D(C)=0
: n=()
(-())
m=[(X-M(X)) ]
C, : m2=n2-n12
, , . ( 0). ( ) : s=m3\s3
, : =(m4\s4)-3