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Posted by **liz** on Tuesday, February 28, 2012 at 8:55pm.

Is the answer the mean cannot be calculated since the individual scores of each student are not available.

- Math for the middle school and elementary teacher -
**MathMate**, Tuesday, February 28, 2012 at 9:38pmTo calculate the mean, you need the

*total*score and the*total*number of students.

Can you find a way to reconstitute these two numbers, knowing that

mean = total score / number of students

- Math for the middle school and elementary teacher -
**liz**, Tuesday, February 28, 2012 at 9:42pmI don't think you can find the total score because you would need the individual scores, right? I tried dividing 82/25 but that wouldn't work because we don't have all the scores...am I on the right track if not, can i please have some guidance? thank you!

- Math for the middle school and elementary teacher -
**MathMate**, Tuesday, February 28, 2012 at 10:03pmhint:

For each class

mean = total score / number of students

=>

for each class

total score=mean*number of students

So the total score for each class is known. Can you find the total score for both classes? Total number of students?

- Math for the middle school and elementary teacher -
**liz**, Tuesday, February 28, 2012 at 10:19pmThe answer is 79, correct? Thank you for your guidance and help:)

- Math for the middle school and elementary teacher -
**MathMate**, Tuesday, February 28, 2012 at 11:08pmExcellent & well done!! :)

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