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by jube » Fri Jun 18, 2010 8:48 am
Stuart Kovinsky wrote: Hi,

the weighted average formula is:

Weighted average = (% weight group 1)*(average of group 1) + (% weight group 2)*(average of group 2) + (% weight group 3)*(average of group 3) + ...

The sum is only relevant in calculating the average of each individual group; it doesn't play a role when using the weighted average formula (or the number line/ratio method).
got it! thanks! that helps.

Just one more thing - so % wt. of group 1 = (no. of items in grpup 1/total no. of items)100?
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by Stuart@KaplanGMAT » Fri Jun 18, 2010 9:33 am
jube wrote:
Just one more thing - so % wt. of group 1 = (no. of items in group 1/total no. of items)100?
Correct!
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