Terrance has a summer job mowing lawns. His earnings for the first 9 weeks are given below $225, $280, $300, $200, $190, $250, $220, $205, $195 How much does Terrance need to earn in week 10 to have earned an average of $250 per week?
To find an average, we add all the numbers and then divide by the quantity of numbers. In this case, add all 10 numbers, divide by 10 and that will equal the average of $250.
