Math՚s: Measures of Central Tendency: Mode and Calculation of Mode (For CBSE, ICSE, IAS, NET, NRA 2022)

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Mode- Meaning

The word ‘Mode’ means ‘Fashion’ in French language. In statistics, the observation that occurs most frequently in the data is called mode of the data. Mode is denoted by .

Calculation of Mode

Ungrouped Series

In an ungrouped series, we look at the frequencies of all the observations. The observation which occurs most frequently is mode.

Example (i) - Find the mode of the following data-

3, 7, 6, 5, 3, 8, 7, 2,7, 8,1

Solution- Arrange the series in ascending or descending order-

1, 3, 3, 5, 6, 7, 7,7, 8,8

Since, 7 has the highest frequency, 7 is mode.

Example- (ii) Find the mode of the following data

Find the Mode of the Following Data
Size47111724
Frequency310142113

Solution- Since in the above series, the highest frequency is 21 which corresponds to 17. Thus, mode is 17.

Grouped Series

In a grouped series, we first locate the class interval having the maximum frequency. The class having the maximum frequency is the modal class. Then the values corresponding to the modal class is substituted in the following formula to find the mode.

Where, : lower limit of the modal class; : frequency of the modal class; : frequency of the class preceding the modal class; : frequency of the class succeeding the modal; : Size of the modal class.

Example- Find mode from the following data

Find Mode from the Following Data
Class Interval10 - 2020 - 4040 - 6060 - 8080 - 100
Frequency47122011

Solution

Find Mode from the Following Data
Class IntervalFrequency
10 - 204
20 - 407
40 - 6012
60 - 8020
80 - 10011

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