Compare the ratios 3:8 and 1 2
.

1. Write ratios as fractions.

3
8
and 1
2

2. Find a common denominator.

2 is a factor of 8, so the common
denominator is 8.

Which comparison correctly compares the ratios 3:8 and 1
2
?

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%