Frequency Distribution


 
 
Concept Explanation
 

Frequency Distribution

Frequency:

The number of times a particular observation occurs in a given data is called its frequency of an observation.The observation having maximum frequency is known as mode.

Illustration: In a data 7,6,5,5,4,3,2,2,5,1,3 find the frequency of 5.

Solution: Here the frequency of 5  in this data is 3.

Frequency Distribution: 

The tabular arrangement of data sharing their corresponding frequencies is called a frequency distribution. Frequency tells you how often something happened. The frequency of an observation tells you the number of times the observation occurs in the data.

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Sample Questions
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Question : 1

From the frequency table, the percentage of families with less than 3 children is  large frac {x}{40} times 100.  Find the value of  x:

Number of children01234
Number of families2511157

 

Right Option : D
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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 1-2 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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Question : 3

Given below are the marks secured by 20 students in a test. 20, 26, 49, 44, 12, 17, 22, 10, 5, 47, 33, 32, 23, 34, 45, 16, 4, 8, 21, 28. How many students are there who secured less than 20 marks ?

Right Option : A
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