[xsl] Getting average

Hi,

I have an XML file in the following format:

<cutomers>
        <group income=1000>
                <person age=10/>
                <person age=15/>
                <person age=30/>
        </group>

        <group income=2000>
                <person age=10/>
                <person age=40/>
        </group>        
        
        <group income=5000>
                <person age=20/>
                <person age=20/>
        </group>                
</customers>

I would like to find the average of incomes for people of a particular
age? I am using XSLT 1.0. A double pass is not practical. Maybe this is
stupid simple and I am missing something basic, but I would appreciate
some help on this.

Thanks,
HC.

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