Which of these groups of numbers has the smallest mean?
Group A: 1, 2, 3, 4, 5, 6, 7, 8, 9
Group B: 1, 2, 3, 4, 6, 6, 7, 8, 9
Group C: 1, 2, 2, 4, 5, 6, 7, 8, 9
Group D: 1, 3, 3, 4, 5, 6, 7, 9, 9
1
A
2
B
3
C
4
D
Which of these groups of numbers has the smallest mean?
Group A: 1, 2, 3, 4, 5, 6, 7, 8, 9
Group B: 1, 2, 3, 4, 6, 6, 7, 8, 9
Group C: 1, 2, 2, 4, 5, 6, 7, 8, 9
Group D: 1, 3, 3, 4, 5, 6, 7, 9, 9