Zack counts 12 total stars on a paper. 1/3 of the stars are yellow. How many yellow stars are on the paper?

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%