Hi all,
A B C
1 Date Tonnes Grade
2 1/06/12 200 5
3 5/06/12 300 6
4 10/06/12 600 4
I have a data set representative of the above (although thousands of rows) and need to calculate a weighted average grade for those values which have a date >= 1/06/12 and <= 6/06/12. Any thoughts on how I can do this?
Thanks in advance!
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