Median is a measure of central tendency useful in describing the typical experience, or the typical case. It's a type of average along with the mean, but less susceptible to skew from outlying values. Mean is useful when you need the math to work out, such as when you want your average daily sales to sum to your total monthly sales. Median is useful in describing, say, what the typical sale looks like, or what the typical customer is likely to spend.
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