Correct Answer - Option 1 : 6

**Given:**

Average of four consecutive even numbers = (1/4) × sum of all

**Concept used:**

Average = (sum of elements)/(number of elements)

**Calculation:**

Let the four consecutive even numbers be x, x + 2, x + 4, x + 6.

The difference between first and last numbers = x + 6 - x = 6

**∴ The required difference is 6.**