Can someone assist me with what I'm doing wrong with the formula below?
It keeps returning a blank in the resulting cell. I am trying to
calculate the weighted avg. of production scores for an employee based
on hours worked per month. columns B,D,F,H,J, and L are the hours while
C,E,G,I,K, and M are the prod scores. Manual calculation should result
in a 90.9% weighted averge.

B C D E F G H I J K
L M wgtd. Avg.
129 117 - - 29 75 19 32 - - 50
55 90.9%

=IF(ISERROR(SUMPRODUCT((B13*C13)+(D13*E13)+(F13*G1 3)+(H13*I13)+(J13*K13)+(L13*M13))/(B13+D13+F13+H13+J13+L13)),"",SUMPRODUCT((B13*C13) +(D13*E13)+(F13*G13)+(H13*I13)+(J13*K13)+(L13*M13) )/(B13+D13+F13+H13+J13+L13))

Note: Columns D,E and J,K are blanks. Also, the data above are linked
from other worksheets with "IF" statements.

Whoever can solve this would be be my HERO ........


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salulu
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