Mean = sum of observations/number of observations
Median: Order the observations. Of there are an odd number of observations, the median is the middle one. So if there are n observations (where n is odd) then the median is the (n+1)/2 th observation. If n is even, the median is the average of the n/2 th observation and the (n/2 +1) th.
Mode: Group the observations. The mode is the value or values that appear the most often. There may be no mode, a single mode or lots of them.
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