RD Sharma Solutions for Class 8 Maths - Data Handling III - Free PDF Download
FAQs on RD Sharma Class 8 Maths Solutions Chapter 25 - Data Handling III
1. What is Pictorial Representation?
Pictorial Representation is a representation showing the relation between the given numerical data and information in a diagram. It is one of the simplest and most attractive ways to analyze data with the help of different sections of a circle. This type of representation is often referred to as a pie chart because it looks like a pie with different coloured or patterned sections representing the data. The pie chart is the easiest way to compare all the provided data in a scientific condensed way. This type of representation helps the students to easily process, analyze, and store data and to do comparisons between them when required.
2. What is the importance of a pie chart?
Pie charts are considered to be the easiest way to compare the given information, gauge the range of data to draw the final predictions. Hence this sort of graphical representation of data handling is often used to calculate the profit and loss in a business, marketing or sales materials used in a company and also to compare the percentage scores of students in a class. Retention of the data can be done best by pictorial representation and handling of data in this way is quite handy also. From a more pragmatic viewpoint, pictorial representation often makes the information more accessible to the majority especially when there is a small amount of data.. The concept of pie charts makes it easy for all to represent any data in their day-to-day life. This is the preferred way of representation in mass media also for its easy approach.
3. How is representation done by a pie chart?
The provided data is first converted to the degrees for representing them in a circle which has a total of 360 degrees. This is done by dividing the data by the total value of data and then multiplying by 360 degrees. The other way is to divide the frequency by the total frequency and then multiply by 100. The concept behind these calculations is that the data are just the portions of the angle of a circle which is 360 degrees or the portion of total percentage of 100. Representation of the different sections is done either by different colors, shades or patterns.
4. How to create a perfect pie chart?
A neat and colorful pie chart is the best way of representation. A neat proper presentation also makes a good impression on the teacher and this first impression can bring good marks for the students.
It can be prepared by using the following steps:
First all the values should be added to get the total quantity of the data given
The percentage of each piece of data to be calculated by dividing each value by the total value and multiplying by 100
Each degree of the sector is to be determined by dividing the frequency of each by the total frequency and multiplying by 360.
Proceed to draw the circle with the calculated angles by using a protractor.
An appropriate title should be mentioned.
Mentioning the source of information of the data draws a good impression.
An index of the different colors and patterns used in the pie chart should be mentioned.
5. What are the advantages and disadvantages of pie charts?
Pie chart has an additional advantage of representation of a data than the other forms of representation because of the following reasons:
A visual effective tool for communication which makes the data legible to an uninformed observer
This is probably the easiest way for the observed to understand the information at a glance
Comparison of any data and retaining them in the mind of the observer is possible with this representation.
However, like all other good things, this also has some disadvantages. They are summed up as follows:
When too much data is provided this representation gets clumsy and less effective.
Only one data set can be represented at a time. No two sets can be represented by a single chart
Often decisions made on visual impact give inaccurate results.
This representation cannot be used for a set of negative data.
This data is often manipulated easily so cannot always be reliable.
