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Standard XII
Mathematics
Central Tendency
If in a binom...
Question
If in a binomial distribution mean is 5 and variance is 4, write the number of trials.
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Solution
Mean
=
5
and
Variance
=
4
⇒
n
p
=
5
and
n
p
q
=
4
⇒
q
=
0
.
8
⇒
p
=
1
-
q
=
0
.
2
&
n
p
=
n
(
0
.
2
)
=
5
(
given
)
⇒
n
=
5
0
.
2
=
25
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