Roll a Die question help please

**Nasc0** · November 19th 2012, 12:46 PM

if i roll a die 600 times. whats the mean and standard deviation of the number of 3's that show?

**skeeter** · November 19th 2012, 01:19 PM

probability problems go in the statistics forum

**Plato** · November 19th 2012, 01:30 PM

Originally Posted by Nasc0

if i roll a die 600 times. whats the mean and standard deviation of the number of 3's that show?

If $p$ is the probability of success and $N$ is the number of trials then the mean is $\mu=p\cdot N$ and $\sigma=\sqrt{Np(1-p)}$ .

Thread: Roll a Die question help please