What is the formula used if I want to find an average age by the .

D

Denise

I am creating a spreadsheet one column lists ages 51 through 99 and the 2nd
column lists the number of people at each age. I would like to find the
average age based on the two columns. I know it is an "average" formula -
but I don't know what cell ranges to use. Please helP.
 
E

Earl Kiosterud

Denise,

If the ages are in A2-down, and the frequencies in B2-down, try this:

=SUMPRODUCT(A2:A50*B2:B50)/SUM(B2:B50)
 
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