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BITSAT 2017 Slot 2 Solved Paper
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© examsnet.com
Question : 141
Total: 150
If the variance of the observations
x
1
,
x
2
,
.
.
.
.
.
.
.
,
x
n
is
σ
2
, then the variance of
α
x
1
,
α
x
2
,
.
.
.
.
.
.
.
.
,
α
x
n
,
α
≠
0
is
σ
2
α
σ
2
α
2
σ
2
σ
2
α
2
Validate
Solution:
Variance
=
1
n
∑
(
x
−
x
)
2
σ
2
New variance
=
1
n
∑
(
α
x
−
α
x
)
2
=
α
2
1
n
∑
(
x
−
x
)
2
=
α
2
σ
2
© examsnet.com
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