Range (largest - smallest):

£

Variance:

Standard deviation:

£

The graph shows some individuals and their typical salaries. Below the graph are some measures of the *spread* of incomes of the group.

With the sliders, you can increase everyone's salary. What happens to the measures of spread?

### Absolute pay raise

This slider raises all salaries by a fixed amount:

£

### Percentage pay raise

This slider raises all salaries by the same percentage of the original: