There are two formulas for the computation of the median, depending on whether the size of your sample is even or odd. In both cases, sort the data. If n (the number of observations in your sample) is odd, select (n+1)/2 observation. If n is even, select halfway between the n/2 and n/2+1 observation.
In a sample of adults, the LDL values are (in order from low to high): 1.84, 2.96, 3.49, 3.68, 3.72, 3.73, 3.84, 3.84, 4.14, 4.41, 4.80, 4.26, 5.57, and 5.85. For this data there are an even number of observations (n=14). So we would select halfway between the 7th observation (3.84) and the 8th observation (also 3.84). Thus the median is 3.84 for this data set.
Example:(with formula)
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