There are eight numbers in a row, and their average is 9.3. It is known that the average of the first five numbers is 10.5, the average of the last four numbers is 8.3, and what is the fifth number To sum up the formula and the number

There are eight numbers in a row, and their average is 9.3. It is known that the average of the first five numbers is 10.5, the average of the last four numbers is 8.3, and what is the fifth number To sum up the formula and the number

The fifth number = 10.5 × 5 + 8.3 × 4-9.3 × 8 = 52.5 + 33.2-74.4 = 13.3