Standard deviation
In: 4
Group A: One rich kid and one poor kid. Rich kid income is $3990, poor kid income is $10. Average income of group A is $2000
Group B: 2 middle class kids. Both kids income is $2000. Average income of group B is $2000
Both groups have the same average of income but group A has larger deviation. It means the member of the group has more ‘difference’.
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