Passengers entering London Underground stations, based on the Underground ticketing system gate – dataset from 2016.
data source: Transport For London
Z-score explained : A Z-Score is a statistical measurement of a score’s relationship to the mean in a group of scores. A Z-score of 0 means the score is the same as the mean. A Z-score can also be positive or negative, indicating whether it is above or below the mean and by how many standard deviations.