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Data Handling — Revision Notes

Gujarat Board · Class 7 · Mathematics

Data Handling revision notes for Gujarat Board Class 7 Mathematics: 4 topics in quick points. Part of the Gujarat Board Class 7 Mathematics syllabus.

45 questions2 formulas & key relations5 concepts

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Key Topics to Revise

1

Representative Values and Arithmetic Mean

  • Average is a number that represents or shows the central tendency of a group of observations or data.
  • The average (mean) lies between the highest and the lowest value of the data — it is never smaller than the minimum or larger than the maximum.
  • Arithmetic Mean (A.M.) = Sum of all observations ÷ Number of observations.
2

Mode

  • The mode of a set of observations is the observation that occurs most often (has the highest frequency).
  • A dataset can have more than one mode — if two or more values occur the same (highest) number of times, all of them are modes.
  • To find mode of large data, organise the data in a frequency table using tally marks.
3

Median

  • Median is the middle value of a dataset when the observations are arranged in ascending (or descending) order.
  • Exactly half the observations are above the median and half are below it.
  • To find the median: Step 1 — Arrange data in ascending order. Step 2 — Find the middle value.
4

Bar Graphs and Double Bar Graphs

  • A bar graph is a visual representation of data using bars of uniform (equal) width. The length of each bar represents the frequency or value of that category.
  • Steps to draw a bar graph: (1) Draw horizontal (X-axis) and vertical (Y-axis) axes. (2) Label axes. (3) Choose a suitable scale. (4) Draw bars of equal width with uniform gaps. (5) Give a title.
  • Scale selection: Start at 0. Find the highest value in data. Choose a scale so that the graph is neither too tall nor too small (e.g., 1 unit = 10 or 100).

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Full Notes

Key Concepts

Representative values are numbers that representThe arithmetic mean is calculated byRange is the difference betweenThe mode is the observationThe median is the middle value

Frequently Asked Questions

What are the important topics in Data Handling for Gujarat Board Class 7 Mathematics?
Key topics in Data Handling include Representative Values and Arithmetic Mean, Mode, Median, Bar Graphs and Double Bar Graphs. Study these first, then practise questions on each for Class 7 exams.
How should I revise Data Handling for Class 7 exams?
Learn the core ideas first, then work through the 45 practice questions on Data Handling. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

More resources for Data Handling

All Gujarat Board Class 7 Mathematics Revision Notes

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