Amanda exercises for 50 minutes each day. how many minutes will she exercises in 7 days

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%

An 18% discount on a watch saved a shopper $72. find the price of the watch before the discount

Which situation is an example of an observational study?