Data interpretation is the process of making sense of previously processed data. This collection may be presented in a variety of formats, including bar graphs, line charts, tabular forms, and other similar formats, and hence requires some interpretation. We will learn how to understand data using a different methods and examples. We’ll look at how to make sense of graphical and other types of data. We will learn how to use it to answer the most frequently asked questions in this area of the quantitative aptitude test.
Table of Contents: 
What is Data Interpretation?
Data interpretation is the process of studying available data and using it to calculate the desired result. The data can be presented in numerous formats, including table format, pie chart, line graph, bar graph, or a mix of these.
Types of Data Interpretation
The different types of data interpretation are listed below
1. Tabular DI.
2. Pie Charts.
3. Bar graph
4. Line Graph
5. Caselet DI
1. Tabular DI: Data is presented in horizontal rows and vertical columns in tabular form. A table is one of the most basic and useful tools for summarizing data and presenting it in an understandable manner. In a table, data is organized systematically into columns & rows.
2. Pie Charts: This is a circular chart separated into different sectors. The sectors of the circle are designed so that their area is proportional to the information values presented. Pie charts divide the complete quantity over a total angle of 360° or 100%.
Pie graphs are shaped like pies, with each slice representing the part of the pie given to each category. Here, the data could be presented and transformed into 360 degrees, percentages, or fractions. Statisticians frequently employ exact figures against these industries, whether internally or outside.
3. Bar Graph: In a bar graph, data is displayed by horizontal or vertical bars. One of the parameters is shown on the xaxis, and the other on the yaxis. We must first absorb the information presented and then respond to the questions. A bar graph, often known as a bar chart, uses rectangular bars to depict organized data. These bars are either horizontal or vertical, with length proportionate to the value they represent.
4. Line Graph: A line graph represents quantitative information or the relationship between two changing quantities using a line or curve. We must first absorb the material provided and then respond to the questions. A line graph, often known as a line chart, is a geographical representation of how two variables change over time. A line graph is generated by connecting multiple data points.
5. Caselet DI: In Caselet DI, a long paragraph is supplied as the basis for a series of questions. We must first understand the material provided before responding to the questions.
Tips to Solve Questions Based on Data Interpretation
Students can find a variety of strategies and tricks for solving challenges in data interpretation.
 Read the entire question Carefully, including the data presented in the form of values and graphs.
 Analise the data thoroughly. Don’t be distracted by a large values, and avoid skipping it before giving it a glance.
 Pay attention to the units : Many times, different units are used in the same question. For example, speed is specified in km/h, while time is determined in seconds.
 Use approximations: If the selections are sufficiently far apart, you can estimate values, fractions, and percentages to neighboring quantities.
 Use of unit Digits: If all options have different last digits, we may simply calculate the last digit of our response to discover the correct option.
 Mental calculations: Try to perform mental calculations. It will help to reduce the time to solve the question.
Example problems
Direction: Study the bar graph given below to answer the following questions.
The following bar graph shows the number of different coloured leaves taken for a case study from various trees.
Q1. Yellow colored leaves of Neem are what percent of the green leaves of Banyan tree?
 09.09%
 18.18%
 55%
 55.55%
 None of these
Solution:
Q2. Find the respective ratio between the sum of L.C.M. and H.C.F. to the difference of L.C.M. and H.C.F. of the average number of red leaves on each tree and the average number of yellow leaves on each tree.
 9 : 7
 11 : 9
 13 : 11
 13 : 7
 None of these
Solution:
Direction: Study the given Line Graph carefully to answer the following questions.
The Line Graph given below shows the number of candidates who qualified RRB NTPC exam from Allahabad and Ajmer zone in 5 different years i.e., 2008, 2010, 2012, 2014 and 2016.
Q.1.Number of candidates who qualified from Allahabad zone in year 2008 and 2016 together are how much percent less than the number of candidates who qualified from Ajmer zone in year 2010 and 2012 together?
 20%
 12%
 25%
 16%
 8%
Solution:
Q2. If every year 40% of qualified candidates from Ajmer zone and 60% of qualified candidates from Allahabad zone are Female, then find the sum of number of Male candidates qualified from Ajmer zone in year 2014 and number of Male candidates qualified from Allahabad zone in year 2010 together.
 1740
 2560
 2410
 1920
 2750
Solution:
Directions: Given below table shows the number of cakes of five different types sold by a shopkeeper on four different days. Study the data and answer the questions that follow:
Q1.What is the ratio of no. of cakes of type B sold by the shopkeeper on Saturday and Monday together to the no. of cakes of type E sold by him on the same days?
 72:53
 88:67
 98:73
 92:71
 90:67
Solution:
Q2.What is average no. of cakes of type C sold by shopkeeper on Saturday, Sunday and Tuesday?
 38
 40
 42
 44
 46
Solution:
Direction: Given below pie chart shows percentage distribution of total literate people in five different villages and table shows percentage of literacy rate in these five villages out of total population and number of people who have post graduate degree. Read the data carefully and answer the questions.
Q1. If total number of people who have post graduate degree from all the village together is to be distributed in the degree pie chart, then find the central angle for people who have post graduate degree from A & D together.
 100°
 140°
 220°
 180°
 150°
Solution:
Q2. Find average number of people who have not post graduate degree from A, D & E (consider only literate people)?
 720
 640
 520
 360
 480
Solution:
Frequently Asked Questions about D.I
What’s difference between data analysis and data interpretation?
Analyzing data is the process of identifying patterns in data gathered through inquiry and determining what those patterns might represent. Interpreting data is the process of attempting to understand the patterns that were identified.
What is Data Interpretation?
Data interpretation is the process of examining available data and using it to calculate the desired result. The data can be presented in numerous formats, including table format, pie chart, line graph, bar graph, or a mix of these.
What are the different types of data interpretation?
The several forms of data interpretation are listed below:
Tabular DI.
Pie Charts
Bar Line Graph
Caselet DI
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