Irene R. answered 12/02/19
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BS in Mechanical Engineering and Certified math teacher for 13 years
To determine his average, you would add all of the scores together and divide by the number of scores (here there are 6 test scores , not 5).
Sum of scores: 75 + 83 + 85 + 94 + 85 + 98 = 520 total points
Average: 520 / 6 = 86.7