Table Graph (Part 1)

Duration: 25 min

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This educational video features a lecture by Yash Jain Sir from Knowledge Gate Eduventures, focusing on Data Interpretation techniques for competitive exams. The session begins with an introduction to the topic, emphasizing the importance of practice through motivational slides. The core of the lecture revolves around solving four specific questions derived from a dataset titled '2019 Pre-Election Survey'. This dataset is presented in a tabular format containing data for various Indian states, including Andhra Pradesh, Assam, Bihar, and others. The table provides four key metrics: Number of Electorate, Number of Stations, Number of Candidates, and Number of seats available. The instructor systematically works through each question, demonstrating how to extract relevant data, perform necessary calculations, and apply approximation techniques to arrive at the correct answers efficiently. The problems cover a range of Data Interpretation concepts, including calculating averages, determining pie chart angles, analyzing percentage thresholds, and computing percentage changes in ratios over time.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with a vibrant title card displaying 'DATA INTERPRETATION' in bold white letters against a purple background with abstract shapes. This transitions to a slide with a pink background featuring the word 'Questions' in large blue font, flanked by a rocket and a planet illustration. Below this, there are three distinct visual panels. The left panel shows the word 'Questions' in red 3D text surrounded by question marks. The middle panel contains a motivational quote in black text: 'DON'T PRACTICE UNTIL YOU GET IT RIGHT PRACTICE UNTIL YOU CAN'T GET IT WRONG'. The right panel shows a desk with glasses and sticky notes labeled '1. PRACTICE', '2. PRACTICE', '3. PRACTICE'. In the bottom right corner, the instructor, Yash Jain Sir, is visible, introducing the session. He sets the stage for the upcoming problems, emphasizing the need for rigorous practice to master these types of questions.

  2. 2:00 – 5:00 02:00-05:00

    The instructor introduces the primary data source for the session: a table titled '2019 Pre-Election Survey'. The table lists ten states in the first column: Andhra Pradesh, Assam, Bihar, Gujarat, Karnataka, Maharashtra, Orissa, Tripura, Chhattisgarh, and Jharkhani. The subsequent columns are labeled 'Number of Electorate', 'Number of Stations', 'Number of Candidates', and 'Number of seats available'. The instructor highlights the importance of reading the table carefully, circling specific column headers like 'Number of Stations' and 'Number of seats available' in red ink. He also writes '4 questions' on the right side of the screen, indicating the scope of the exercise. He points out specific rows, such as Andhra Pradesh and Jharkhani, to draw attention to the data values. The visual focus is on understanding the structure of the table and identifying the relevant columns needed to solve the upcoming problems.

  3. 5:00 – 10:00 05:00-10:00

    The first question appears on screen: 'Which state shows maximum number of average electorate per polling station?' The options provided are (A) Jharkhand, (B) Maharashtra, (C) Bihar, and (D) Orissa. The instructor explains that this requires calculating the ratio of 'Number of Electorate' to 'Number of Stations' for each of the four options. He begins by analyzing the data for Bihar, noting the values 15058548 and 15261. He approximates these to 150 and 152 to simplify the division. He performs similar approximations for Maharashtra (293/294), Orissa (129/137), and Jharkhand (78/77). By comparing these simplified ratios, he determines that Jharkhand has the highest value because its numerator is slightly larger than its denominator, whereas the others are slightly less than 1. He circles the answer (A) Jharkhand, confirming it as the correct choice based on the visual evidence of his calculations.

  4. 10:00 – 15:00 10:00-15:00

    The second question is presented: 'If we draw a pie chart for seats available in the given states, then Gujarat & Orissa together subtends and angle of ___ degrees at the center.' The options are (A) 96, (B) 100, (C) 104, (D) 108. The instructor first sums the 'Number of seats available' for Gujarat (26) and Orissa (11) to get a combined total of 37. He then calculates the total number of seats across all states, which he determines to be 133. Using the formula for pie chart angles, he sets up the calculation: (37 / 133) * 360. He approximates the fraction 37/133 to roughly 28% or 1/3.5. He then multiplies this percentage by 360 degrees. Through his handwritten calculations on the screen, he arrives at an approximate value of 100 degrees. He circles the option (B) 100, indicating it is the correct answer. The visual evidence includes the red circles around the seat numbers and the step-by-step arithmetic written in red ink.

  5. 15:00 – 20:00 15:00-20:00

    The third question introduces a new condition: 'If number of seats available per candidates are more than 13%, then the state is called proper state. How many states given in the chart are not proper states?' The options are (A) 4, (B) 6, (C) 5, (D) 3. The instructor proceeds to calculate the percentage of seats per candidate for each state by dividing the 'Number of seats available' by the 'Number of Candidates'. He marks states as 'proper' with a checkmark and 'not proper' with a cross if the percentage is less than or equal to 13%. He calculates values like 6/48 (12.5%) for Assam, marking it as not proper. He continues this process for Bihar, Maharashtra, and others. He counts the number of states marked with a cross. The visual evidence shows a column of checkmarks and crosses next to the data, and he circles the final count of non-proper states to select the correct option.

  6. 20:00 – 24:37 20:00-24:37

    The final question involves a hypothetical scenario: 'In Andhra and Karnataka, if the number of Polling stations are increased by 15% & 16% respectively with respect to 2017 Election, while the number of seats remained the same then for these seats combined, what is the percentage change in the number of polling stations per seat in year 2019 with respect to that in year 2017?' The instructor sets up a comparison between 2017 and 2019 data. He notes the 2019 station counts (29614 for Andhra, 22999 for Karnataka) and the seat counts (21 and 15). He works backward to find the 2017 station counts by reversing the percentage increases. He then calculates the 'stations per seat' ratio for both years. Finally, he computes the percentage change between the 2017 ratio and the 2019 ratio. The screen shows complex handwritten calculations involving fractions and percentages, leading to the final answer. The instructor concludes the session with a 'THANKS FOR WATCHING' slide.

The video provides a comprehensive walkthrough of Data Interpretation problems, moving from basic ratio comparisons to more complex percentage change calculations. The instructor emphasizes approximation techniques to save time, a crucial skill for competitive exams. By visually demonstrating each step with handwritten notes and highlighting key data points, the lecture reinforces the method of breaking down complex problems into manageable parts. The progression from simple averages to pie chart angles and finally to percentage changes in ratios offers a structured approach to mastering this topic.