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CBSE XI
>>
Math
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Statistics
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Q)
Given
ˉ
x
is the mean and
σ
2
is the variance of n observations
x
1
,
x
2
,
x
3
.
.
.
.
.
.
x
n
prove that the mean and variance of the observations
a
x
1
,
a
x
2
,
a
x
3
.
.
.
.
.
.
.
a
x
n
are
a
ˉ
x
and
a
2
σ
2
, respectively ,
(
a
≠
0
)
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