Frequency Distribution
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:
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 |
The scores obtained by a group of participants in a game are shown in the table. A participant who scores more than 3 points receives a hamper. If the number of participants who do not receive hampers is twice the number of those who do, find the value of y.
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| Right Option : B | |||||||||||||
| View Explanation | |||||||||||||
From the following frequency table, find out how many students failed if the pass marks are 40.
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| Right Option : D | |||||||||||||||||
| View Explanation | |||||||||||||||||
A random survey of numbers of children of various age group playing in a park was found as follows. Children playing under the age of 7 years are:
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| Right Option : C | |||||||||||||||||||
| View Explanation | |||||||||||||||||||
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