Explanation:

- First, let's identify all the prime numbers less than 15: 2, 3, 5, 7, 11, and 13.

- Next, add these prime numbers together: 2 + 3 + 5 + 7 + 11 + 13 = 41.

- Now, count how many prime numbers there are. There are 6 prime numbers.

- Calculate the average by dividing the sum by the count: 41 / 6 ˜ 6.83.

- Option 1: 6.33 - This is incorrect. It does not match our calculated average.

- Option 2: 5.67 - This is incorrect. It is lower than our calculated average.

- Option 3: 6.83 - This is correct. It matches our calculated average.

- Option 4: 7.33 - This is incorrect. It is higher than our calculated average.