Answer:
689.6
Explanation:
Let's say n is the number of numbers being added (n=8).
The average of the sum of n numbers is sum/n.
For example, let's say the numbers are 4, 5, and 6.
There are 3 numbers: 4, 5, and 6
4 + 5 + 6 = 15 ==> the sum of the numbers.
15/3 = 5 ==> 5 is the average of the numbers
5 * 3 = 15
Now back to the problem:
Since the average is 86.2, multiply that with the total number of numbers (which is 8) to get the total sum of all numbers:
86.2 * 8 = 689.6
Hence, the answer is 689.6.