SUMPRODUCT - Creating a weighted score in column with subtotals

[DP]

Col A Col B
Count Average Score Manual Calculation
Single 0 -
Single 1 5.00
Single 2 4.83
Single 2 4.00
Single 0 -
Sub Total 5 4.53 22.67
Single 0 -
Single 3 4.22
Sub Total 3 4.22 12.67
Single 3 4.78
Single 0 -
Single 1 3.00
Single 1 4.67
Sub Total 5 4.40 22.00
Sub Total 2 3.83 7.67
Grand Total 15 4.37 4.33

Using Excel 2003

This is my current calculation and it returns 4.37 for the Grand Total line.
(SUMPRODUCT(A3:A17,A3:A17)/SUM(A3:A17)))

Trying to create a weighted average score for a group of items. The
Subtotals use the SUMPRODUCT command for the Singles above.
Using a SUMPRODUCT command for the Grand Total should work, but when I
manually calculate it out I'm getting a different number - 4.33 instead of
4.37.
Can you tell me what needs to be fixed?

 

[Bernie Deitrick]

=SUMPRODUCT((A3:A17="Single")*B3:B17*C3:C17)/SUMIF(A3:A17,"Single",B3:B17)

HTH,
Bernie
MS Excel MVP

 

[DP]

Bernie - I copied this calculation and am getting an error message
(#VALUE!). Are there any Add-In's that need to be active in order for it to
work?

 

[Bernie Deitrick]

DP,

No, no add-ins, but you cannot have a dash in place of a zero or a blank.

HTH,
Bernie
MS Excel MVP