user: ### NOW ANSWER:
Question: Which Number of households has a County of cook, and Population smaller than 5176?
Columns: ['County', 'Per capita income', 'Median household income', 'Median family income', 'Population', 'Number of households']
Types: ['text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['Washington', '$36,248', '$79,109', '$92,087', 238136.0, 87859.0]
SQL:

assistant: SELECT AVG("Number of households") FROM "Table" WHERE "County" = 'cook' AND "Population" < 5176.0;