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Standard XI
Mathematics
Mean Deviation about Mean
The sum of de...
Question
The sum of deviations of
n
observations from
25
is
25
and sum of deviations of the same
n
observations from
35
is
−
25
. Find the mean of the observations
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Solution
∑
x
i
−
25
n
=
25
∑
x
i
−
35
n
=
−
25
10
n
=
50
n
=
5
∑
x
i
−
25
n
=
25
∑
x
i
−
12
n
=
25
∑
x
i
=
150
∴
¯
x
=
∑
x
i
n
¯
x
=
150
5
¯
x
=
30.
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