Interquartile Range

- The box extends to the first and third quartile of the dataset drawing the interquartile range.
- NumPy’s quantile() function will find the first and third quartile:
```
dataset = [4, 8, 15, 16, 23]
first_quartile = np.quantile(dataset, 0.25) 
third_quartile = np.quantile(dataset, 0.75)
```