Example 10: 5 people were asked about the time in a week they spend in doing social work in their community. They said 10, 7, 13, 20 and 15 hours, respectively.
Find the mean (or average) time in a week devoted by them for social work.
Example 11: Find the mean of the marks obtained by 30 students of Class IX of a school, given in Example 2.
Measures of Central Tendency
Very often we need to analyse a given data to find a value that can represent the entire data set. In other words we say the central tendency of the data set. Different types of data would require different methods to find this central value which can be used as the representation of the entire data set. For example, average number of students can be find using the mean of the data, splitting apples in large sized and small sized groups would require median and for a shoe company mode will be the best measure to decide about the investment.
So, following are three measures of central tendency that you must understand by watching the video embedded below.
- Mean
- Median
- Mode
=> Introduction to Statistics – Must watch tutorial 
