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Write the formula for the median of a grouped data. Explain symbol with their used meaning.

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Medain (M) = [ l + \(\cfrac{\frac{n}{2}-c.f}{f}\) ] × h

l = lower limit of the median class, 

n = sum of the frequency 

c.f = cumulative frequency of the class preceding the median class 

f = frequency of the median class 

h = length of the class

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