Mathematics · 2014
JEE Main · 11 April 2014, Shift 1 · Q87
If X has a binomial distribution, B(n, p) with parameters n and p such that P ( X =2)= P ( X =3), then E ( X ), the mean of variable X, is:
If X has a binomial distribution, B(n, p) with parameters n and p such that $\displaystyle \mathrm{P}(\mathrm{X}=2)=\mathrm{P}(\mathrm{X}=3)$, then $\displaystyle \mathrm{E}(\mathrm{X})$, the mean of variable X, is :
Official answer
(2)
$\displaystyle 3-p$
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JEE Main 2014 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.