=SUMPRODUCT((A1:A100>=20)*(A1:A100<=30))
"Excel worksheet funtions" skrev:
> How can I calculate ages for example I have colums with ages and I need to
> know how many people between of age of 20 to 30?
Do you mean >=20 but <= 30?
Try one of these:
=COUNTIF(A1:A10,">=20")-COUNTIF(A1:A10,">30")
=INDEX(FREQUENCY(A1:A10,{20,30}-{1,0}),2)
=SUMPRODUCT(--(A1:A10>=20),--(A1:A10<=30))

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Biff
Microsoft Excel MVP
> How can I calculate ages for example I have colums with ages and I need to
> know how many people between of age of 20 to 30?