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Standard XII
Mathematics
Standard Deviation about Mean for Continuous Frequency Distributions
In binomial d...
Question
In binomial distribution, the sum and the product of mean and the variance are
25
3
and
50
3
respectively. Determine the distribution.
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Solution
Mean
=
n
p
Variance
=
n
p
q
n
p
+
n
p
q
=
25
3
n
2
p
2
q
=
50
3
Also
q
=
1
−
p
on solving we get
n
=
15
p
=
1
3
q
=
2
3
B
in rational distribution is at
15
distribute trails in which probability of success
=
1
3
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