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.
You tell whats the same and different.
six
30
4 4 6 6 10
(3, 4, 5, 7, 8, 9)
45
You tell whats the same and different.
six
30
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.
Mathematical mean is the same as an average, e.g. sum of all numbers divided by the amount. The sum is 42 and there are six numbers so the mean is 7.
There are at least 7 such sets, among them, 1,2,6,6,6,7,7.