Acircle has a diameter of 10 centimeters. what is the best approximation of its area? use 3.14 to approximate for π . a: 15.7 cm² b: 31.4 cm² c: 78.5 cm² d: 314 cm²

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%