function(keys, values, rereduce) {
	var tot = 0;
	var count = 0;
	if (rereduce) {
		for (var idx in values) {
			tot += values[idx].tot;
			count += values[idx].count;
		}
	}
	else {
		tot = sum(values);
		count = values.length;
	}
	return {tot:tot, count:count, avg:tot/count};
}