Find the interquartile range of 17, 23, 8, 5, 9, 16, 22, 11, 13, 15, 17, 18

Just tell me how to set up the equation.

At the electronics store you have a coupon for 20% off up to 2 cds you buy for cds with the original cost of $10.99 each the sales tax is 5% what is the total cost of your purchase

Asurvey of 2,000 doctors showed that an average of 3 out of 5 doctors use brand x aspirin. how many doctors use brand x aspirin