If a /b = p /q, then (a + b )/b =
(p + b )/q
(p + p)/q
(p + q)/q
(p + a)/q

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%