# Basics of Statistics

May 20, 2022## Central tendencies

- test
- one item
- second item

### Mean or average

Sum of the data divided by its count

### Median

Middle-most value if the number of data points is odd, or the average of the two middle-most values if the number of data points is even.

good algo: quickselect

## Dispersion

How spread the data is.

### Range

max - min