If Ronald is calculating the time required to fill the swimming pool. He found it takes 8 minutes to fill the swimming pool with 72 gallons of water. At what rate does the swimming pool fill, in gallons per minute?

Peaches cost $4.29 per pound. find the cost of two and a quarter pounds of peaches.

Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population standard deviation is 3. be sure to show that you know the formula and how to plug into it. also, clearly state the margin of error.

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?