# Frequency Distribution Class-9 RS Aggarwal ICSE Maths Goyal Brothers

Frequency Distribution Class-9 RS Aggarwal ICSE Maths Goyal Brothers Prakashan Chapter-15. We provide step by step Solutions of Exercise / lesson-15 Frequency Distribution ( Statistics )for ICSE Class-9 RS Aggarwal Mathematics .

Our Solutions contain all type Questions with Exe-15 to develop skill and confidence. Visit official Website CISCE for detail information about ICSE Board Class-9 Mathematics.

## Frequency Distribution Class-9 RS Aggarwal ICSE Maths Goyal Brothers Prakashan Chapter-15 (Statistics)

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Notes on Frequency Distribution

Exercise 15

### Notes on Frequency Distribution

A frequency distribution is a tabular arrangement of data whereby the data is grouped into different intervals, and then the number of observations that belong to each interval is determined. Data that is presented in this manner are known as grouped data.

#### Data

• Facts /figures numerical or otherwise collected for a definite purpose is called as data.
• data collected first-hand data:- Primary
• Secondary data: Data collected from a source that already had data stored

#### Frequency

– The number of times a particular instance occurs is called frequency in statistics

#### Ungrouped data

Ungrouped data is data in its original or raw form. The observations are not classified in groups.

#### Grouped data

In grouped data, observations are organized in groups

#### Class Interval

• The size of the class into which a particular data is divided.
• divisions on a histogram or bar graph.
• Class width = upper class limit – lower class limit

#### Regular and Irregular class interval

• Regular class interval: When the class intervals are equal or of the same sizes.
• E.g 0-10, 10-20, …………
• Irregular class interval: When the class intervals are of varying sizes.
• E.g 0-15, 15-45, 45-75, ……….

#### Ungrouped frequency table

– When the frequency of each class interval is not arranged or organised in any manner.

#### Grouped frequency table

– The frequencies of the corresponding class intervals are organised or arranged in a particular manner, either ascending or descending.

#### Frequency table

– A frequency table or distribution shows the occurrence of a particular variable in a tabular form.

#### lower class limit

The smallest value that can belong to a given interval is called the lower class limit,

#### upper class limit.

the largest value that can belong to the interval is called the upper class limit.

#### class width

The difference between the upper class limit and the lower class limit is defined to be the class width.

#### cumulative frequency

The cumulative frequency distribution is obtained by computing the cumulative frequency, defined as the total frequency of all values less than the upper class limit of a particular interval, for all intervals. From a frequency distribution, this can be done by simply adding together the frequencies of the interval and all other preceding intervals

### Exe-15 Frequency Distribution Class-9 RS Aggarwal ICSE Maths Goyal Brothers Prakashan Chapter-15 (Statistics)

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