A class of 30 students recently took a test. If 20 students scored 80, 8 students scored 90, and 2 students scored 100, then what was the class average (the mean) on this test?

TheEarlyMathster Aug 25, 2020

#1**0 **

*A class of 30 students recently took a test. If 20 students scored 80, 8 students scored 90, and 2 students scored 100, then what was the class average (the mean) on this test?*

Add up all the scores then divide that total by the number of students.

20 students made 80 so the total of those 20 is 20 • 80 = 1600

8 students made 90 so the total of those 8 is 8 • 90 = 720

2 students made 100 so the total of those 2 is 2 • 100 = 200

Add up all the scores 1600 + 720 + 200 = 2520

Divide that by 30 2520/30 = **84 is their average **

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Guest Aug 25, 2020