Representation of Data

Histogam : A histogram is a graph of the given data in form of a  collection of rectangles. 

Bar Graph : A bar graph is a graph with rectangular bars with  lengths proportional to the values that they represent. Bar  graph is a diagrammatic representation of discrete data. 

Pie Chart (Circle Graph) : Pie chart is a circular chart divided into sectors in which the  arc length, its central angle and area are proportional to the  quantities that it represents. 

Measures of Central Tendency

Arithmetic Mean (AM) : The average or Arithmetic Mean (AM) or simply mean is  defined as follow 

Median : To find median of an individual series, arrange the given  numbers in ascending or descending order. 

Rule -

1. If the number of observations is od, then 

2. If the number of observations is even, then 

Gauhati University

Gauhati University

Gauhati University

Gauhati University

Gauhati University

Gauhati University