Some model railroads use an O scale in replicas of actual trains. The O scale uses the ratio 1 inch = 4 feet. How many feet long is the actual locomotive if an O scale replica is 18 inches long?

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%