define mean and median
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mean
There are several kinds of mean in mathematics, especially in statistics. For a data set, the arithmetic mean, also called the expected value or average, is the central value of a discrete set of numbers: specifically, the sum of the values divided by the number of values.
median
denoting or relating to a value or quantity lying at the midpoint of a frequency distribution of observed values or quantities, such that there is an equal probability of falling above or below it.
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Mean
It is the total of all the values, divided by number of values.
Median
It is the middle number in the list of numbers ordered from lowest to highest.
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