RS Aggarwal Solutions Class 8 Chapter-24 Pie Charts (Ex 24A) Exercise 24.1

• Sort the information into categories.

• Determine the total.

• Separate the categories.

• Convert to a percentage.

• Finally, total the degrees.

Maker of Pie Charts

You have now learned how to use geometric tools to create a Pie Chart for the given data. This section will teach you how to create a Pie Chart using an online tool. To create the desired Pie Chart, people frequently use the graphing feature in Excel sheets. We have, however, provided an online Pie Chart maker.

Pie Charts have a fairly narrow use case that is particularly well encapsulated by their definition. To use a Pie Chart, you must have a whole amount that has been divided into a number of distinct parts. In a Pie Chart, your primary goal should be to compare each group's contribution to the whole, rather than comparing groups to each other. If the above criteria are not met, the Pie Chart is inapplicable, and a different plot type should be used instead.

The values that make up a whole and the categories that divide the whole are generally of two types. First and foremost, when the 'whole' represents a total number. Examples include the number of votes cast in an election divided by candidate, or the number of transactions divided by user type (e.g. guest, new user, existing user).

When the total is a sum over an actual data variable, this is referred to as the second type of 'whole.' For Example, we might be interested in the monetary total of all transactions rather than the number of transactions. Dividing this total by an attribute such as user type, age bracket, or location may reveal where the business is most successful.

A Pie Chart's data can be summarised in a table like the one above, where the first column represents a category and the second column represents the proportion, frequency, or amount of that category. Unless it is to be listed somewhere else on a generated figure, the total usually does not need to be specified separately. Alternatively, some tools can simply work with the unaggregated data as shown in the table below, aggregating it into the table above at the time of Pie Chart creation.

How Do You Answer Pie Chart Questions?

This section will teach you how to solve or interpret the Pie Chart to obtain the original values. To do so, we must first determine whether the given chart is presented in percentages, degrees, or without a value. We can answer the questions about Pie Charts using this information. Let's take a look at the solved Example to get a better understanding of this.

Pie Chart Applications

• It is used in business to compare areas of growth such as turnover, profit, and exposure.

• To display categorical data.

• To demonstrate a student's performance in a test, etc.

Advantages

• The illustration is straightforward and simple.

• Data can be visually represented as a fraction of a whole.

• It contributes to the provision of an effective communication tool for even the most uninformed audience.

• At a glance, provides a data comparison for the audience to provide an immediate analysis or to quickly understand information.

• There is no need for readers to Examine or measure underlying numbers, which can be avoided by using this chart.

• You can manipulate data points in the Pie Chart to emphasize a few points you want to make.

Disadvantages

• It becomes less effective when there are too many data points to use.

• If there are too many data points. Even if you include data labels and numbers, they may become crowded and difficult to read.

• Because this chart only represents one data set, a series is required to compare multiple sets.

• This may make it more difficult for readers to quickly analyze and assimilate information.

Producing a Pie Chart

The following steps are used to create a Pie Chart, and the data is calculated using the above-mentioned formulas.

Step 1: Enter all of the data into a table and total all of the values.

Step 2: To find the percentage values, divide each value by the total and multiply by 100.

Step 3: To calculate the number of degrees required for each pie sector, we take a full circle of 360° and apply the formula: 360° (Frequency/Total Frequency)

Step 4: Once all of the degrees for making a Pie Chart have been calculated, use a protractor to draw a circle (Pie Chart) using the calculated measurements.