Calculate the average number of beneficiaries per postal point in Guam.
DIVIDE(SUM(total_beneficiaries), COUNT(zip_code)) where name = 'Guam';
SELECT CAST(SUM(T2.total_beneficiaries) AS REAL) / COUNT(T2.zip_code) FROM state AS T1 INNER JOIN zip_data AS T2 ON T1.abbreviation = T2.state WHERE T1.name = 'Guam'