2, 5, 6, 7, 9
Divide the given group of numbers into two groups such that the numbers in each group have the same mean.
One possible way to divide the given numbers into two groups having the same mean is: 
- Group 1: {2, 9} which has a mean value of (2+9)/2 = 5.5 
- Group 2: {5, 6, 7} which has a mean value of (5+6+7)/3 = 6. 

Both Group 1 and Group 2 have means close to each other.