Statistics: Mean

Hello friends,

I am going to start a new series of statistics. This is the first part of this series & it includes Calculation of Mean using various methods:


  1. Direct Method
  2. Assumed Mean Method
  3. Step Deviation Method
As you all know, There are three measures of central tendencies, namely-Mean, Median, & Mode, which tries to describe the entire set of data.
Mean: Mean is defined as the sum of all observations divided by Number of observations in a set.


For grouped data, we use class intervals to represent the data.
A class Interval consist of two values: Upper Limit & Lower Limit

Calculation of Class Mark: Class Mark of a class interval can be calculated by dividing the sum of upper limit & lower limit by 2.


1. Direct Method:


2. Assumed Mean Method:

3. Step Deviation Method:
Solved Numericals finding the mean using all the three methods in the lecture below:




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