Tom had test scores of 75,84,and 81.what was his average score?

It's 80. You have to add up 75, 84, and 81 and divide it by 3 because that's the amount of numbers that you're given. So, for example, if you were given the number 77,90,67,92, and 98 the average would be 84.8 because you have to add all the numbers then divide it by the amount of numbers you have.