Background: When thinking of central tendency, one area of consideration would be if there are any outliers. These are important to point out as they can alter your central tendency. Depending on how far they are outside the norm, they can alter your conclusion if not correctly noted.

Question: (Including reference(s) and citation(s)), can you define what is an outlier and how is this relevant to our central tendance decision?

References and citation(s) greatly appreciated.