.. M(X), D(X), .
. ..
1 | 2 | 3 | n | ||
1 | 2 | 3 | n |
M(X)=x1p1+x2p2++xnpn
. () , .
.
1/6 | 1/6 | 1/6 | 1/6 | 1/6 | 1/6 |
()= 1*1/6+2*1/6+3*1/6+4*1/6+5*1/6+6*1/6=3,5
():
1. ()=*().
2. (+)=()+()
3. (*)=()*()
. .., 1,2,,n,
() , .. -() , .. .., : 1-(), 2-(),, n-().
. ..
.. .
.. ..
. .
.
. ..
0,3 | 0,5 | 0,2 |
D(X)? ?
: ()= 0*0,3+1*0,5+2*0,2=0,9
, ..
(0-0,9) | (1-0,9) | (2-0,9) | |
0,3 | 0,5 | 0,2 |
D(X)=(0-0,9) *0,3+(1-0,9) *0,5+(2-0,9) *0,2=0,81*0,3+0,01*0,5+1,21*0,2=0,49.
1
f()= - 7.5 +18
dx
- ,
= + =+1
(+1) d + (y-2) dx=0 =1; y =4
,
1+q+q ++ q +, <1
2
*
= 4
f()= ( 2)
dx
,
= -2 +3+6 =+2
dx =2; y =5
|
|
1+1+1++ 1+
3
= *sin +
f()= - 2 +-2 [0,5; 2]
sin dx
,
= ; = ; = 0; = 2
-=0 = -4; y = 2
10.
4