The monthly earnings of a group of business students are are normally distributed with a standard deviation of 589 dollars. a researcher wants to estimate the mean monthly earnings of all business students. find the sample size needed to have a confidence level of 95% and a margin of error of 132 dollars.

Harry and jay are both flying on the same plane with an airline that randomly assigns seats to passengers. of the 182 total seats on the plane, 62 are window seats, 58 are middle seats, and the rest are aisle seats. what is the approximate probability that both harry and jay will be assigned aisle seats on the same plane? a. 11.48% b. 3.3% c. 2.08% d. 26.26%

Find the area of the region that is inside r=3cos(theta) and outside r=2-cos(theta). sketch the curves.

Tommy buys a sweater that is on sale for 40% off the original price. the expression p -0.4p can be used to find the sale price of the sweater, where p is the original price of the sweater. if the original price of the sweater is 50, what is the sale price?