Measures of Central Tendency

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Introduction

     When some data is colleted, we have certain numbers which represent the characteristics of the data, around which the data appears to be concentrated, we call such numbers as the measures of central tendency. There are three measures of central tendency. (i) Mean (ii) Median and (iii) Mode.

Mean

     Mean is the arithmetic average.

     To find mean of ungrouped data and it is obtained by adding the raw scores and dividing the sum by the number of items.

     There are three methods to find mean for a frequency distribution. (i) Direct method, (ii) Short-cut method, (iii) Step-deviation method.

Summary

     1. The Arithmetic mean is obtained by dividing the sum of all the items in the list by the total number of items.

     2. There are three methods to find mean for a frequency distribution. (i) Direct method, (ii) Short-cut method, (iii) Step-deviation method.