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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?

 Aug 25, 2020
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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    

.

 Aug 25, 2020

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