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Byju's Answer
Standard XII
Mathematics
Measure of Dispersion
The algebraic...
Question
The algebraic sum of the deviations of a set of
n
values from their mean is
A
0
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B
n
−
1
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C
1
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D
n
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Solution
The correct option is
B
0
Let
A.M. of
x
1
,
x
2
,
.
.
.
.
x
n
=
x
1
+
x
2
+
.
.
.
.
+
x
n
n
=
K
Mean deviation
=
∑
n
1
(
x
−
K
)
n
=
x
1
−
K
+
x
2
−
K
+
.
.
.
.
+
x
n
−
K
n
=
x
1
+
x
2
+
.
.
.
.
+
x
n
−
n
K
n
=
x
1
+
x
2
+
.
.
.
.
+
x
n
n
−
K
⇒
K
−
K
=
0
Hence, the algebraic sum of the deviations of a set of n values from their mean is
0
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1
Similar questions
Q.
The algebraic sum of the deviations of a set of n values from their mean is
(a) 0
(b) n − 1
(c) n
(d) n + 1