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

The frequency table shows the marks obtained by a group of students in a monthly test. Calculate the percentage of students who failed the test if 40 is the passing mark. 

MarksNumber of students
0-195
20-297
40-5914
60-7911
80-993
Right Option : D
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Question : 2

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 : 3

30 children were asked about the number of hours, they watched TV programs in previous week. The results are as follows: 1, 6, 2, 3, 5, 12, 5, 8, 4, 8 10, 3, 4, 12, 2, 8, 15, 1, 17, 6, 3, 2, 8, 5, 9, 6, 8, 7, 14, 12. How many children watch TV more than 15 hours?

Right Option : C
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