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Questions  >>  JEEMAIN and NEET  >>  Mathematics  >>  Class12  >>  Probability
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Q)

A random variable X follows binomial distribution with mean $ \alpha$ and variance $ \beta$ Then

$\begin {array} {1 1} (A)\;0< \alpha < \beta & \quad (B)\;0 < \beta < \alpha \\ (C)\;\alpha < 0 < \beta & \quad (D)\;\alpha < 0 < \beta \end {array}$

 

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A)
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$ 0 < Q < 1$
$ \Rightarrow 0 < npq < np$
$ \therefore 0 < variance < mean$
$ \Rightarrow 0 < \beta < \alpha$
Ans : (B)
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