() X . X, x 1, x 2,..., xn p 1, p 2,..., pn , :
HB X [ , b ]. C X :
.
: X M (X)
() D (X) X :
D (X) X :
X , - .
:
1. , 9 .
. n =36. m =4 (3+6, 4+5, 5+4, 6+3). :
() = n/m = 4/36 = 1/9 0.111
: , 9 , 0.111.
2. . 0.8, 0.9. .
. : , . . :
(+) = () + () - () = 0.8 + 0.9 - 0.8*0.9 = 0.98
: 0.98.
3. 3 : - 2000 , - 3000 , - 1000 . 10%, - 5%, - 15%. , .
. 2000+3000+1000=6000 . : 1 , 2 , 3 . :
( 1) = 2000/6000=1/3; ( 2) = 3000/6000 = 1/2; ( 3) = 1000/6000 = 1/6
. :
(/ 1) = 0.9; (/ 2)= 0.95; ( / 3)= 0.85
:
() = (1)* (/ 1) + ( 2) * ( / 2) + ( 3) * (/ 3) =
=1/3*0.9 + 1/2*0.95 + 1/6*0.85 = 0.917
: , , 0.917.
4. 15 , 5 - 10 . - 0.9, 0.8. . , - ?
. : 1 -, 2 .
( 1)= 5/15 = 1/3; ( 2)= 10/15 = 2/3
. :
( / 1)= 0.9; (/ 2 ) = 0.8
:
( 1/ ) = ( 1) * (/ 1)/( ( 1) * ( / 1) + ( 2) * ( / 2))= 0.36
( 2/ ) = ( 2) * ( / 2)/(( 1) * ( / 1) + ( 2) * ( / 2))= 0.64
|
|
: , , , -.