Mary and lamar establish a tutoring service at a local mall. they tutor college students in math and english. they charge $40 per hour for tutoring. in the month of january they charged for 200 tutoring hours. the expenses of their business are given in the table below. expense amount/month rent of space $4000 electricity $325 advertising $375 using the formula profit = $40(number of hours) – (expenses) , calculate their profit for the month of january.

Aconcession manager at yankee stadium wants to know how temperature affects beer sales. she took a sample of 10 games and recorded the number of beers sold and the temperature in the middle of the game. temperature 80 68 78 79 87 74 86 92 77 84 number of beers 20533 1439 13829 21286 30985 17187 30240 87596 9610 28742 a. draw a scatter plot of the data. b. the manager estimates the regression equation to be: numberofbeers = −100, 678 + 1, 513 ∗ temperature draw this on your scatter plot. c. for one of the estimated points, indicate the residual with ei . d. for that same point, indicate what part of the variation is explained by the model with ˆyi − y¯.