Andy earned the subsequent grades on his four math quizzes: 97, 78, 84, and 86. What is the average of his four quiz grades?
To ?nd out the average, you must add the items (97 + 78 + 84 + 86 = 345) and divide the sum through the total number of items (4); 345 ÷ 4 = 86.25. Remember to add a decimal point and zeros after the decimal while dividing (345.00 ÷ 4).