user: ### NOW ANSWER:
Question: What was the original air date of series number 10?
Columns: ['Series Number', 'Number of Episodes', 'Original Air Date', 'DVD Region 2 release date', 'DVD Region 1 release date']
Types: ['real', 'real', 'real', 'text', 'text']
Sample row: [1.0, 6.0, 1973.0, '2 September 2002', 'TBA']
SQL:

assistant: SELECT AVG("Original Air Date") FROM "Table" WHERE "Series Number" = 10.0;