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Q.

For a binomial variate X with n=6 if P(x=2)=9(P(x=4))  then its variance is

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a

8/9

b

1/4

c

9/8

d

4

answer is C.

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Detailed Solution

P(X=2)=9 P(X=4) 6C2P4×q2=9 6c4p2×q4 p=3q p+q=1;n=6 σ2=npq
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For a binomial variate X with n=6 if P(x=2)=9(P(x=4))  then its variance is