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

### Instruction:
What is the average rank of the record on 2007-06-21 with a mark less than 91.29?

### Inputs:
table_name: table, columns: ['Rank', 'Mark', 'Athlete', 'Place', 'Date']

### Response:
SELECT AVG Rank FROM table WHERE Date = 2007-06-21 AND Mark < 91.29