# Stats - Notation

> Source: https://ollybritton.com/notes/a-level/maths/topics/stats/notation/ · Updated: 2020-09-10 · Tags: stats, year-1

# Notation
## $x$ in Algebra vs Stats
### Similarities
* Represent the value of some quality
* Variables can be discrete or continuous
* Can be part of a larger calculation
	* For example, $2x$ could be double the heights of everyone.
	* This is known as [Stats - Coding](https://ollybritton.com/notes/a-level/maths/topics/coding/).

### Differences
* Variables can represent multiple objects, like a set.
* Can do operations on $x$ like it's a collection of values:
	* $\sum x$, the sum of all values in $x$
	* $\bar{x}$, the mean of all values in $x$.

##### The main notational difference between stats and algebra for $x$ is??
That $x$ can represent multiple objects, like a set.

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