thamarai selvan percentage and datainterpretation.pptx

percentage and datainterpretation.pptx

1. DATA INTERPRETATION Dr THAMARAI SELVAN M CTPCR Coordinator & Assistant Professor Department of Electronics and Communication System Sri Ramakrishna College of Arts & Science Coimbatore - 641 006 Tamil Nadu, India 1 Sri Ramakrishna College of Arts & Science

2. Data Interpretation Data Interpretation (DI)  means nothing but understanding the given data to get inferences with the proper analysis of that data. To solve these types of problems, the usage of data interpretation tricks is important for effective time management and to save time in competitive exams by doing fast calculations. In this type of question, some data is provided in the form of tables or bar charts or pie charts or graph format , and questions are asked based on the given data. Our task is to answer those questions simply by interpreting and analyzing the data smartly. 2 Sri Ramakrishna College of Arts & Science

3. How to solve Data Interpretation Questions quickly Data Analysis and Interpretation are just about playing with numbers using basic maths operations Additions, Subtractions, multiplications.   Is it Right?  Some data is given in the form of graphs, tables, charts. We need to analyze that data and answer the given questions. 3 Sri Ramakrishna College of Arts & Science

4.  How to improve the calculation ability Memorize some basic maths   Mathematical tables up to 20. Squares of numbers 1 2  to 30 2 . Cubes of numbers 1 3   to   20 Powers of 2 up to 6. Powers of 3 up to 5. Fractional values 1/2, 1/3  ……… 1/20 2. Learn some   fast calculation tips   to save time Multiplication , Addition , Division, Approximation Percentage , average ,cubes, square roots and cube roots Comparison of fraction 3 . Skip time-consuming questions and do them at the end. Don’t waste time with lengthy calculations: 4 Sri Ramakrishna College of Arts & Science

5. Data Interpretation Formulas We use some aptitude formulas in solving DI questions. Most Common questions are asking in this format from Percentages 1)  X is what % of y that means  x/y * 100. Eg :  72 is what % of 360 = [72/360]×100 =20% 2)  What percentage is x of y? I.e.  x/y * 100. 3)  X is what percent more than y =  x-y/y * 100 4)  X is what percent less than y =  y-x/y * 100 5)  Percentage change between two particular values =  [final – initial/ initial] * 100 5 Sri Ramakrishna College of Arts & Science

6. Example of Data Interpretation The bar graph given below shows the data of the production of paper (in lakh tonnes ) by three different companies X, Y and Z over the years. 6 Sri Ramakrishna College of Arts & Science

7. Example of Data Interpretation Questions 1 :For which of the following years, the percentage rise/fall in production from the previous year is the maximum for Company Y? A. 1997. B. 1998 C. 1999 D. 2000 7 Sri Ramakrishna College of Arts & Science

8. Example of Data Interpretation Questions 2 : In which year was the percentage of production of Company Z to the production of Company Y the maximum? A. 1996. B. 1997 C. 1998 D. 1999 8 Sri Ramakrishna College of Arts & Science

9. Example of Data Interpretation Questions 3 :The average production for five years was maximum for which company? A. X B. Y C. Z D . X and Z both. 9 Sri Ramakrishna College of Arts & Science

10. Lets do to the practice of exercise questions - Data Interpretation 10 Sri Ramakrishna College of Arts & Science

11. Lets do to the practice of exercise questions - Data Interpretation 1.What are the average marks obtained by all the seven students in Physics? (rounded off to two digit after decimal) A. 77.26 B. 89.14. C. 91.37 D. 96.11 2.The number of students who obtained 60% and above marks in all subjects is? A. 1 B. 2. C. 3 D. None 3.What was the aggregate of marks obtained by Sajal in all the six subjects? A. 409 B. 419 C. 429 D. 449. 4.In which subject is the overall percentage the best? A. Maths . B. Chemistry C. Physics D. History 5.What is the overall percentage of Tarun ? A. 52.5% B. 55% C. 60%. D. 63% 11 Sri Ramakrishna College of Arts & Science

12. Lets do to the practice of exercise questions - Data Interpretation 1.What are the average marks obtained by all the seven students in Physics? (rounded off to two digit after decimal) A. 77.26 B. 89.14. C. 91.37 D. 96.11 12 Sri Ramakrishna College of Arts & Science

13. Lets do to the practice of exercise questions - Data Interpretation 2.The number of students who obtained 60% and above marks in all subjects is? A. 1 B. 2. C. 3 D. None Answer: Option B Explanation: From the table it is clear that Sajal and Rohit have 60% or more marks in each of the six subjects. 13 Sri Ramakrishna College of Arts & Science

14. Lets do to the practice of exercise questions - Data Interpretation 3.What was the aggregate of marks obtained by Sajal in all the six subjects? A. 409 B. 419 C. 429 D. 449. 14 Sri Ramakrishna College of Arts & Science

15. Lets do to the practice of exercise questions - Data Interpretation 4.In which subject is the overall percentage the best? A. Maths . B. Chemistry C. Physics D. History 15 Sri Ramakrishna College of Arts & Science

16. Lets do to the practice of exercise questions - Data Interpretation 5.What is the overall percentage of Tarun ? A. 52.5% B. 55% C. 60%. D. 63% 16 Sri Ramakrishna College of Arts & Science

17. Do more practice questions 17 Sri Ramakrishna College of Arts & Science Wish you all the best THANK YOU