Weighted Avg

Posted on 2011-03-10
Last Modified: 2012-05-11
I'm having a senior moment.  If I have a table like this, what's the formula for a weighted average?  Is the value I have on the right correct?
APPLE      24      8%      1%
BANANA      36      40%      9%
ORANGE      1      0%      0%
CHERRY      15      21%      2%
GRAPE      27      33%      5%
LIME      2      0%      0%
LEMON      10      18%      1%
STRAWBERRY      41      16%      4%
BLUEBERRY      10      28%      2%
Grand Total      166      25%      24%
Question by:error_prone
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LVL 37

Expert Comment

ID: 35099408
It's hard to see exactly what you are doing. Are you trying to get the average SR Rate?
In that case, multiply each count*sr_rate and divide the total by the total count. I get a little over 26%.
LVL 37

Expert Comment

ID: 35099438
Oh, yes I see what you did. The way you did it works just fine except you round too much.
Do it without rounding and you'll get close to 26.48
LVL 37

Expert Comment

ID: 35099457
Oops. I typed a number wrong. You actually would get around 23.518.
I would still do the calcutations without rounding and then round at the end if desired, but you are correct and have done it a correct way.
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LVL 37

Expert Comment

ID: 35099480
For example: If you change the 33% on Grape to 34%, then the actual weighted average is around 23.68 but you get 25 if you round each number first.
LVL 37

Accepted Solution

TommySzalapski earned 500 total points
ID: 35099503
Here's the spreadsheet I used for calculations in case you find it useful.

Author Closing Comment

ID: 35104355

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