Add them all together and divide by 6.
45
six
The "mean" of a group of numbers is their "average". It doesn't tell you what the numbers are, or even how many numbers there are.
30
Work with the total sums of the numbers:The mean of eight numbers is 41, so the total of those eight numbers is 8 x 41 = 328The mean of two of those eight numbers is 29, so the total of those two numbers is 2 x 29 = 58So the total of the other six numbers must be the difference between these two totals, that is 328 - 58 = 270Thus the mean of these six numbers is their total divided by 6, namely 270 ÷ 6 = 45.
1,2,3,4,5,15
Any numbers that are equivalent to 21.
4 4 6 6 10
(3, 4, 5, 7, 8, 9)
6 (six)
It means 5 hundred, twenty-six.
There are at least 7 such sets, among them, 1,2,6,6,6,7,7.