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Standard X
Mathematics
Assumed Mean Method
If the algebr...
Question
If the algebraic sum of deviations of 20 observations from 30 is 20, then the mean of observations is
___
.
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Solution
20
∑
i
=
1
(
x
i
−
30
)
=
20
20
∑
i
=
1
x
i
−
20
×
30
=
20
⇒
20
∑
i
=
1
x
i
=
620.
M
e
a
n
=
20
∑
i
=
1
20
=
620
20
=
31
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