## Elementary Statistics: A Step-by-Step Approach with Formula Card 9th Edition

$\mu=120$ $\sigma^2=24$ $\sigma=4.9$
We have $p=0.8$ and $n=150$ mean=$\mu=np=120$ variance=$\sigma^2=np(1-p)=24$ standard deviation=$\sigma=\sqrt {np(1-p)}=4.9$