John's test grades are 69, 86, 100, and 105. What is his average?

John’s average test score is 90.

Step-by-step explanation:

To find the average of a set of numbers, we must find the sum of all of the numbers (add them together) and then divide by the amount of numbers in the set. In this case, we begin by finding the sum of the four numbers:

69 + 86 + 100 + 105

= 360

Then, we divide by 4, since there are 4 scores in the data set.

360/4 = 90

Therefore, John’s average test score is 90.

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