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

1