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Mean, Median, Mode

mean Description: 441.png= Description: 446.png
Median : Median is the middle term in the collected data. In case of even number of terms, take average of middle terms.
median = Description: 451.png
L-lower limit of median class
N-total frequency = Σ fi
h -width of median class.
C-cumulative frequency upto class preceding median class
f -cumulative frequency of median class
Mode : It is the value that occur most frequently or it is the value with maximum frequency.
mode = Description: 456.png × h
L-lower limit of class certaining mode
fi-maximum frequency
fi–1-frequency preceding fi
fi+1-frequency just after fi
h-size of model class
Points to be noted
  • For asymmetric distribution : mean = medians = mode
  • For normal distribution : mean – mode = 3(mean – median).

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