4 of 25 4. Alfred built a raised flower bed using 9 railroad ties of equal length. The railroad ties were each 8 feet long. Which expression has a value equal to the perimeter of the flower bed? A. 23 x 32 B. 32 x 42 C. 42 x 33 O D. 84 x 42

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%