Explanation:

- Find eligible numbers: We're looking for multiples of 2 or 5 between 1 and 50.

- List the numbers: These numbers are: 2, 4, 5, 6, 8, 10, 12, 14, 15, 16, 18, 20, 22, 24, 25, 26, 28, 30, 32, 34, 35, 36, 38, 40, 42, 44, 45, 46, 48, 50.

- Count the numbers: There are 30 numbers in this list.

- Calculate the sum: The sum of these numbers is 775.

- Average: Divide the sum by the count of numbers, 775 ÷ 30 = 25.8333.

- Rounded average: Round to one decimal place gives 25.8.

- Correct Option:

- Option 2: 25.8