I thinks i might be wrong so i am posting the

Quote:

Originally Posted by

**mr fantastic** You should calculate $\displaystyle Pr(X \leq 85)$ under the null hypothesis X ~ Binomial(n = 200, p = 1/2) and draw a conclusion.

Mr fantastic I think i might be wrong thats why i am posting the starting bit please let em know if i am correct or no???

$\displaystyle H_0 : X \le 85$

$\displaystyle H_a : X > 85$

$\displaystyle z_{0.05}$ : 1.645

$\displaystyle z = \frac{\bar x - \mu}{\sigma/ \sqrt{n}}$

I am pretty sure that this is not correct.....need ur guidance