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For quantitative data it is observed that there is a tendency of the data to be distributed about a central value which is a typical value and is called a measure of central tendency. It is also called a measure of location because it gives the position of the distribution on the axis of the variable.

There are three commonly used measures of central tendency, viz. Mean, Median and Mode. The mean again may be of three types, viz. Arithmetic Mean (A.M.), Geometric Mean (G.M.) and Harmonic Mean (H.M.). Below we shall discuss these different measures.