A purse contains five 10$, four 5$, and eight 1$ bills. If the bills are selectedone by one in random order, what is the probability that at least two bills mustbe selected to obtain a first 10$?

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%