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It's a value that is much different from the rest of the values. For example, if you were averaging the ages of all of the kids in a kiddy pool, and there is one adult in there - the adult's age would be considered an "outlier". Usually the outliers are discarded before measures of central tendencies are used.

1, 2, 8, 7, 5, 10, 200

200 Would be the outlier in this case.

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14y ago
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10y ago

An outlier is a number that is unusually different from the rest of the set.

An example would be if there were ten kids in a class, nine of them had grades of 90+ and one of them failed with a 0 (can happen if they never showed up).

The average of the entire class would go WAY down because of the 0.

Just assuming, for example, the grades were 91, 92, 93, 94, 95, 96, 97, 98, and 99, then without the outlier, the average would be 95. But if you put the 0 in, the average goes down to 85.5, which is nearly 10 point difference in average which is a big step when there are only 10 grades to begin with.

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Q: What is an outliers?
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