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Byju's Answer
Standard XII
Mathematics
Standard Deviation about Mean for Continuous Frequency Distributions
If the mean o...
Question
If the mean of binomial distribution with
9
trials is
6
, then its variance is
A
2
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B
3
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C
4
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D
√
2
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Solution
The correct option is
A
2
Mean
=
n
p
n
p
=
6
(
9
)
(
p
)
=
6
p
=
2
3
Hence, variance
=
n
p
(
1
−
p
)
=
6
(
1
−
2
3
)
=
6
(
1
3
)
=
2
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