The data set
2, 3, 5, 6, 6, 8
x x-m (x-m)²
2 -3 9
3 -2 4
5 0 0
6 1 1
6 1 1
8 3 9
6)30 6)24
5 4
so m = 5, and s = 4
There are many possibilities.
Some other answers are listed below
data set: 1, 4, 6, 6, 6, 7
data set: 1, 5, 5, 5, 7, 7
data set: 2, 3, 5, 6, 6, 8 (the one above)
data set: 2, 4, 4, 5, 7, 8
data set: 3, 3, 3, 7, 7, 7
data set: 3, 3, 5, 5, 5, 9
data set: 3, 4, 4, 4, 6, 9
Edwin