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Consider the marks (out of 100 ) of 50 students as below :

40, 39, 43, 62, 30, 47, 33, 31, 17, 28
36, 29, 40, 32, 39, 24, 57, 42, 15, 30
50, 52, 47, 65, 31, 07, 37, 47, 17, 20
25, 53, 65, 85, 89, 56, 55, 41, 43, 10
44, 40, 69, 22, 40, 65, 39, 36, 71, 12

The range of the variate (marks) is very large. Also we are eager to know the performance of the students. The passing limit is 35 and above. Marks between 35 and 44 form the third class ( or grade). Marks ranging between 45 - 59 are considered as second class and 60 - 100 form the first class. Thus we have a grouped frequency distribution as:

Table - 7


Index

2.1 Introduction
2.2 Tabulation
2.3 Classification
2.4 Methods of classification
2.5 Relative frequency distribution
2.6 Cumulative frequency
2.7 Bivariate frequency distribution

Chapter 3





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