# What are the mean and standard deviation of a binomial

What are the mean and standard deviation of a binomial probability distribution with n=21 and $p=\frac{4}{17}$?
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Explanation:
For Binomial Probability Distribution
The Mean $=np=21\left(\frac{4}{17}\right)=\frac{84}{17}$
Standard Deviation
$=\sqrt{npq}=\sqrt{np\left(1-p\right)}=\sqrt{21\left(\frac{4}{17}\right)\left(1-\frac{4}{17}\right)}=1.94$