Mean is the average of a set of numbers.
Mode is the most common value in a set of numbers
Median is the value that is right in the middle of the set, when the set is arranged in a sequence.
Which you use greatly depends on exactly what you want to know, given what each tells you.
So, for example, if I wanted to know _about_ what it costs to purchase blueberries in the grocery store, I would use the mean to get the average value.
If I wanted to know what I was most likley to pay, I would use the mode to see what value occurs most often.
If my data set had outliers (like a really pricey store that was 3x more expensive than everywhere else) I might use the median to see the value right in the middle.
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