The mean average of a set of numbers is the sum of the numbers divided by how many of them there are.
If there are 8 numbers with a sum of 2464, their mean average is 2464 ÷ 8 = 308.
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Since there are 8 numbers, their average is 1/8 of their sum.
The average of nine numbers is 99, that is tha the sum of those numbers was 99 x 9, which is 891. The average of 8 numbers is 89, that is that the sum of those numbers was 89 x 8, which is 712. So, 891 - 712 = 179 The number that was deleted was 179.
Add the numbers together (sum) and divide by two (average). SUM: 2 + 8 = 10 AVG: 10 / 2 = 5
average is 9 so 8, 9 & 10
The fourth number is 10.