Posted by **jerson** on Monday, September 8, 2008 at 9:13pm.

in an algebra class of 21 students the mean grade on a test was 87; in another class with 32 students the mean grade was 81. What is the combined mean of the two classed?

my teacher said it's 21 * 87 + 32 * 81/53= 83.4

but i'm not sure where the 53 came from..

thanks in advance

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