Is 109 divided by 5 equal 21 R2

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%

How do you find the distance of each number from the mean

The perimeter of a quarter circle is 14.28 miles. what is the quarter circle's radius?