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The mean (average) is the sum of all values divided by the number of values. It represents the central tendency of the data but can be skewed by outliers.
Mean = (Σx) / n
The median is the middle value in a sorted data set. For odd counts, its the central value; for even counts, its the average of the two middle values. Its robust against outliers.
The mode is the value(s) that appear most frequently. A data set can be unimodal, bimodal, or multimodal, useful for categorical data.
The range is the difference between the largest and smallest values, indicating the spread of the data.