# Math Help - Roll a Die question help please

1. ## Roll a Die question help please

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

2. ## Re: Roll a Die question help please

probability problems go in the statistics forum

3. ## Re: Roll a Die question help please

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 $\sigma=\sqrt{Np(1-p)}$.