Use the Pythagorean theorem to find z. Leave your answer as a simplified radical or as a decimal rounded to the hundredths place.
6
X
7

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%