An outlier is an observation that lies an abnormal distance from other values in a random sample from a population.
Think about heights among your classmates. Most students might fall within 5'4" to 6'2". But there's one student who's exceptionally tall at 6'8". That student would be considered an outlier because his height significantly deviates from the norm.
Standard Deviation: This term refers to a measure that quantifies the amount of variation or dispersion of a set of values.
Normal Distribution (Bell Curve): A bell curve describes statistical data which balances around an average or mean value with symmetrical distribution on either side.
Z-Score: A Z-score indicates how many standard deviations an element is from the mean. It can be used to identify outliers.
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