P2B · Statistics · STAT.MEAN.MEDIAN

Mean and median

Intuition

Understand first, compress later.

Statistics describes data and separates visible patterns from random variation.

Switch representations

Dot plotn = 20 · mode 1

one observationmode (most frequent value)

Every dot is one observation; n = 20. The tallest column stands over 1 — that is the mode (8 of 20). The values run from 0 to 4.

Formal view

You can mean and median when you can recognise the underlying objects, select valid rules and check each step for equivalence or logical implication.

Why does it work?

This skill sits on a prerequisite network. If a step is unstable, repair the missing prerequisite instead of merely doing more items of the same type.