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Formula Sheet

Tales by Dots and Lines — Formula Sheet

CBSE · Class 8 · Mathematics

10 formulas from Tales by Dots and Lines (CBSE Class 8 Mathematics) on one page, grouped by topic. Part of the CBSE Class 8 Mathematics syllabus.

63 questions76 flashcards10 formulas & key relations5 concepts

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10 Entries · 6 Sections

Formulas and Key Relations

1. Mean and Median Basics

(x1 + x2 + x3 + ... + xn) / n = a

Average of 3 and 7 = 5

2. Effect of Changing Data

((5x1) + (5x2) + (5x3) + ... + (5xn)) / n = 5a

3. Finding the Unknown

Average weight of the players = Sum of weight of all players / Number of players

349 + w = 392

w = 392 - 349 = 43

4. Mean and Median with Frequencies

average = Sum of all the values in the data / Number of values in the data

((3 × 3) + (4 × 11) + (5 × 9) + (6 × 7) + (7 × 3) + (8 × 1) + (9 × 1) + (10 × 1)) / (3 + 11 + 9 + 7 + 3 + 1 + 1 + 1) = 188 / 36 = 5.22

Mean = sum of all values ÷ number of values

Total = average × number of values

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Frequently Asked Questions

What are the important topics in Tales by Dots and Lines for CBSE Class 8 Mathematics?
Key topics in Tales by Dots and Lines include Mean and Median: Core Ideas, Finding the Unknown from the Mean, Mean and Median with Frequencies, Spreadsheets and Cell References. Study these first, then practise questions on each for Class 8 exams.
How many formulas are in Tales by Dots and Lines?
This sheet lists 10 formulas from Tales by Dots and Lines, grouped by topic. Learn what each symbol stands for so you can apply the formula, not just recall it.
How should I revise Tales by Dots and Lines for Class 8 exams?
Learn the core ideas first, then work through the 63 practice questions on Tales by Dots and Lines. 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.

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All CBSE Class 8 Mathematics Formula Sheet

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