Re: find sample mean and S.D

Part b) looks good but 36 is in the square root, not 30.

For part a) $\displaystyle \displaystyle \mu_{\bar{x}} = \mu , \sigma_{\bar{x}} = \frac{\sigma}{\sqrt{n}}$

Re: find sample mean and S.D

Quote:

Originally Posted by

**pickslides** Part b) looks good but 36 is in the square root, not 30.

For part a) $\displaystyle \displaystyle \mu_{\bar{x}} = \mu , \sigma_{\bar{x}} = \frac{\sigma}{\sqrt{n}}$

thanks a lot, so for part c, do I just follow part b to find: P(z<3)=p(<=2)?