Explanation:

- The initial average of the 50 results was calculated as 30. This means the sum of these results was \( 50 \times 30 = 1500 \).

- Due to an error, 73 was considered as 33 in the sum calculation. So, the incorrect sum was \( 1500 - 33 + 73 = 1540 \).

- The correct average should be the correct sum \(1540\) divided by the total number of results \(50\).

- New correct average: \( \frac{1540}{50} = 30.8 \).

- Option:1, 29.2 - This option underestimates the correct average.

- Option:2, 30.8 - This option accurately reflects the correct calculation.

- Option:3, 31.6 - This option overestimates the correct average.

- Option:4, 34 - This drastically overestimates the correct average.

- Correct Answer: Option:2, 30.8