DAvg

Return the average of a set of numeric values in a set of records.

Syntax
      DAvg ( expression, domain, [criteria] )

      =DAvg("[Field]", "Table")

Key
   expression The numeric values to average.

   domain     The set of records, a table or a query name.

   criteria   Equivalent to an (optional) WHERE clause.
              Any field that is included in criteria must
              also be a field in domain.

The DAvg() function may be used in VBA or in an SQL query.

Example

DAvg("UnitPrice", "T_Orders", "SupplierID = 64 ")

This is equivalent to:
SELECT DAvg([T_Orders].UnitPrice) AS AveragePrice
FROM [T_Orders]
WHERE (([T_Orders].SupplierID)=64);

“If you are planning for a year, sow rice; if you are planning for a decade, plant trees; if you are planning for a lifetime, educate people” ~ Chinese Proverb

Related:

Avg (SQL) - Average
Eavg (Allen Browne) - Get the average of just the TOP values.