user: Question: What is the average number for the song "O Sudha"?
Columns: ['Number', 'Song Title', 'Lyricist', 'Singer(s)', 'Length']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Tu', 'Dev Kohli/Biddu/ Sonu Nigam', 'Sonu Nigam', '4:26']
SQL:

assistant: SELECT AVG("Number") FROM "Table" WHERE "Song Title" = 'O Sudha';