RD Sharma - Mathematics (Volume 2)

Book: RD Sharma - Mathematics (Volume 2)

Chapter: 33. Binomial Distribution

Subject: Maths - Class 12th

Q. No. 27 of MCQ

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27

Mark the correct alternative in the following:

Suppose a random variable X follows the binomial distribution with parameters n and p, where 0 < p < 1. If is independent of n and r, then p equals.


Given:



P=?


P(x=r)= nCr pr qn-r


=


P(x=n-r)= nCn-r pn-r qn-(n-r)


= nCr pn-r qr


=


Put values in equation, we have:






1-p=p


1=2p


P=1/2

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