## We are interested in

- A single value for the measure of dispersion
- Known as the Standard Deviation (SD)

- So just take the square root
- And you are done !

- A single value for the measure of dispersion

## The "bell" curve

- The scatter of a real-life sample
- Typically approximates to the shape of a bell
- Hence its name "bell curve"

- The scatter of a real-life sample

## Given the bell curve formula

- We can do some fancy math

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