Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What was the original air date of series number 10?

### Inputs:
table_name: table, columns: ['Series Number', 'Number of Episodes', 'Original Air Date', 'DVD Region 2 release date', 'DVD Region 1 release date']

### Response:
SELECT AVG Original Air Date FROM table WHERE Series Number = 10