Frequency Distribution


 
 
Concept Explanation
 

Frequency Distribution

Frequency Distribution: 

Frequency table or frequency distribution is a method to present raw data in the form, from which on can easily understand the information contained in the raw data.  Frequency distributions are of two types:

  • (i) Discrete or ungrouped frequency distribution
  • (ii) Continuous or grouped frequency distribution
  • Discrete Frequency Distribution :

    The process of preparing this type of distribution is very simple. The construction of a discrete frequency distribution from the given raw data is done by the use of the method of tally marks. In the first column of the frequency table we write all possible values of the variable from the lowest to the highest.

    Illustration : Draw a discrete frequency distribution of the number of children in 20 families:  1,1,2,3,4,3,2,1,1,4,5,2,4,2,2,1,3,3,2,5

    Solution : The data may be put in the form of a discrete frequency distribution as follows:

    No. of children

    Tally bars

    Frequency

    1 5
    2 6
    3 IIII 4
    4 III 3
    5 II 2
    .... (More Text Available, Login?)
    Sample Questions
    (More Questions for each concept available in Login)
    Question : 1

    A survey was carried out for the purpose of determining the number of children in each family. The results are shown in the table below. Calculate the percentage of families which have more than 2 children. 

    Number of children01234
    Frequency14762

     

    Right Option : B
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    Question : 2

    A random survey of numbers of children of various age group playing in a park was found as follows. Children playing between the age group of 15-17 years are:

    AgeNo. of Children
    1 - 25
    2 - 33
    3 - 56
    5 - 712
    7 - 109
    10 - 1510
    15 - 174
    Right Option : B
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    Explanation
    Question : 3

    Find the frequency of Class 60-80 by using the given data:

    Class SizeFrequency
    20-408
    40-604
    60-807
    80-1009
    100-1202
    Total32
    Right Option : C
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