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

### Instruction:
What is the average NGC number that has a Apparent magnitude greater than 14.2?

### Inputs:
table_name: table, columns: ['NGC number', 'Object type', 'Constellation', 'Right ascension ( J2000 )', 'Declination ( J2000 )', 'Apparent magnitude']

### Response:
SELECT AVG NGC number FROM table WHERE Apparent magnitude > 14.2