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avatar+392 

In Mrs. Marsh's algebra class, 30 of the 36 students took the Chapter 4 test, and their mean score was $72 \%$. The next day the other six students took the test and their mean score was $78 \%$. What is the new class mean? Express your answer as a percent.

 Apr 7, 2020
 #1
avatar+20981 
+1

If 30 students had an average of 72, then their total points were 30 x 72  =  2160.

If 6 students had an average of 78, then their total points were 6 x 78  =  468.

 

Adding the points of both groups:  2160 + 468  =  2628 points

 

2628 divided by 36 gives an average of 73.

As an percentage, it is 73%.

 Apr 7, 2020
 #2
avatar+392 
+1

thxx

Paresh  Apr 7, 2020

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