Exploring and Describing Data (HSC SSCE Mathematics Standard): Flashcards

Statistical values describing the centre/typical value of a dataset

$\mu$ (mu)

$\overline{x}$ (x-bar)

$\overline{x} = \frac{\sum x}{n}$

$\overline{x} = \frac{\sum fx}{\sum f}$

The middle value when data is arranged in order

Average the $\frac{n}{2}$ and $\left(\frac{n}{2} + 1\right)$ scores

The value that appears most frequently in a dataset

Data with two modes

Approximate (uses class centres not actual scores)