I have a formula that references several other cells and calculates an
average value while it weights each cells value by an incremental X
value.

=-1*((1*K239)+(2*K238)+(3*K237)+(4*K236)+(5*K235)+(6 *K234)+(7*K233)+(8*K232)+(9*K231)+(10*K230))/SUM(K230:K239)

I would like to be able to add a slider to the sheet that would enable
me to adjust the numbere of cells included in the calculation. Each
cell that was added would need to incremented by the x factor. As in
the above formula it also must capture the added cells to be included
for the divisor, in the above example /Sum(K230:D239).

Appriciate any and all ideas.

Michael


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