The following questions refer to the figure below of a CTA of intracranial and extracranial arteries. 
-Which arrow points to the external carotid artery?
Definitions:
Percentile
A statistical metric denoting the value beneath which a certain portion of data points in a set lies.
Third Quartile
The value below which 75% of the observations in a dataset fall, also known as the upper quartile.
Potential Outlier
A data point that differs significantly from other observations, possibly indicating a deviation or anomaly in the dataset.
Measurements
The collection of quantitative data or observations that describe and quantify attributes or characteristics.
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