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The problem description should warn that only XPath 1.0 functions can be used. XPath 2.0 contains "avg" in the specification. It seems that Ruby does not implement it.
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Querying XML Datastores with XPath - 7
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The problem description should warn that only XPath 1.0 functions can be used. XPath 2.0 contains "avg" in the specification. It seems that Ruby does not implement it.