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
1,2,3,4,5,15
Any numbers that are equivalent to 21.
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.
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.