the weights of bags of pet food are distributed normally about the mean, 50 lb. the standard deviation is 0.2 lb.
in a group of 20 bags, about how many would you expect to be within one standard deviation of the mean?
[tex]20 - 50 \div .2[/tex] I assume take the z score or it would be about 30% because of the 60, 95, 97.5 rule which has a technical name that I can't remember
