.
:
30
1 1
1
− =
− Σ
=
N
x
n
i
i x
;
.
,
:
Σ=
= n
i i x
x N
1
1
;
, ,
, . .
.
:
.
1- 4000., 2- -
3000., 3- 5000.
,
600.
.
,
:
150. (600000/4000); 200. (600000/3000); 120.
(600000/5000).
,
:
= 150 200 120
600 600 600
+ +
+ + =3,830.
,
:
=
5000
1
3000
1
4000
1
1 1 1
+ +
+ + =3,830.
:
31
Σ
Σ
=
= = m
i i
i
m
i
i
x
w
w
x
1
1,
− i w ; i i i w = x ⋅ n.
,
,
.
600. .,
660. ., -500. .;
150, 220 100 .
:
=
5
500
3
660
4
600
600 660 500
+ +
+ + =4,757. .ΣΣ
,
,
.. ,
.
n
n
i
i
n
n x Π=
= × × × =
1
1 2....
.
-
,
.
:
|
|
2
, 1,5
. .
3 (21,5).
, 1,75
2
2 1,5
=
+ ;
32
1,751,75=3,0625 , 0,625 6,25%;
:
= 2 × 1,5 = 1,73.
. ,
. , ,
, . .
3 . 1. .
:
3 1000 54,772._ . = × =
,