When ringing up a customer, a cashier needs 17 seconds to process payment as well as 1 second to scan each item being purchased. If it takes 44 seconds to ring up a customer,
how many items are being purchased?

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.

Acircle has a circumference of 28.36 units what is the diameter of the circle

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?