To Captain Black man you are good, you sure your not in my math class? So do I use 0'

Man you are great, are you sure you are not in my math class? So do I use all 0's for (b),or not. This type of math has lost me Quote:

Originally Posted by

**CaptainBlack** A binomialy distributed random variable with $\displaystyle N$ trials and probability of a favourable outcome on a single trial $\displaystyle p$ has prbability of $\displaystyle n $ favourable outcomes in $\displaystyle N$ trials of:

$\displaystyle

b(n;N,p) = \frac{N!}{(N-n)!n!}~p^n(1-p)^{n-1}

$

where the exclamation mark denotes the factorial function.

In this question $\displaystyle N=10$ and $\displaystyle p=1/5$, so for part (a) we have:

$\displaystyle

p(n=2) = b(2;10,0.2) = \frac{10!}{8!2!}~0.2^2~0.8^{8}=45 ~0.2^2~0.8^{8} \approx 0.30199

$

RonL