Tell whether the rates are equivalent. 7 1/2 miles for every 3/4 hour.

1/2 mile for every 3 minutes

Plz help and explain.

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%