user: Question: what's the total number of race winner with rnd being 10
Columns: ['Rnd', 'Race', 'Date', 'Location', 'Pole Position', 'Fastest Lap', 'Race Winner', 'Constructor', 'Report']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Brazilian Grand Prix', '13 March', 'Jacarepaguá', 'Keke Rosberg', 'Nelson Piquet', 'Nelson Piquet', 'Brabham - BMW', 'Report']
SQL:

assistant: SELECT COUNT("Race Winner") FROM "Table" WHERE "Rnd" = 10.0;