user: Question: How many ranks have a rebound average smaller than 6.1?
Columns: ['Rank', 'Player', 'Years', 'Games', 'Reb. Avg.', 'Total Rebounds']
Types: ['real', 'text', 'text', 'real', 'real', 'real']
Sample row: [1.0, 'Don Cohen', '1957–1961', 101.0, 13.0, 1317.0]
SQL:

assistant: SELECT COUNT("Rank") FROM "Table" WHERE "Reb. Avg." < 6.1;