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Tales by Dots and Lines — Practice Quiz

CBSE · Class 8 · Mathematics

Try a 4-question quiz on Tales by Dots and Lines for CBSE Class 8 Mathematics: tap an answer to check it and see why.

63 questions76 flashcards10 formulas & key relations5 concepts

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Quick Quiz: Tales by Dots and Lines

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1

A class data set has 36 values. The 18th and 19th values in order are 5 and 5. What is the median of the data set?

2

A group of 10 wrestlers has an average weight of 39.2 kg. The total weight of 9 wrestlers is 349 kg. What is the missing wrestler's weight?

3

A farmer has 15 coconut trees. The average harvest per tree is 25.6 coconuts. One tree was counted as 3 coconuts more than the actual number. What is the correct average harvest per tree?

4

A frequency table of family sizes has values 3, 4, 5, 6, 7, 8, 9, 10 with frequencies 3, 11, 9, 7, 3, 1, 1, 1. What is the correct average family size?

63 Questions·
multiple choicemultiple correcttrue false

Sample Questions

1multiple choice
3 marks

A data set has 36 values. After ordering, the 14th value is 4 and the 15th to 23rd values are 5. What is the median?

Show answer

5

For 36 values, the median is the average of the 18th and 19th values. Both the 18th and 19th values lie among the 15th to 23rd positions, which are all 5. So the median is 5.

2multiple choice
3 marks

A data set contains 10, 10, 11, and 17. What is the mean?

Show answer

12

Add the values: 10 + 10 + 11 + 17 = 48. Divide by 4 values: 48 / 4 = 12.

3multiple choice
2 marks

The average of a data set is 12. A new value greater than 12 is added. What must happen to the mean?

Show answer

It increases

When a value greater than the mean is added, the balance shifts upward, so the mean increases.

4multiple choice
2 marks

If every value in a data set is increased by 3, and the original mean is 18, what is the new mean?

Show answer

21

Adding 3 to every value increases the mean by 3. So the new mean is 18 + 3 = 21.

+59 more questions on Tales by Dots and Lines (CBSE Class 8 Mathematics)

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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 practice questions are there for Tales by Dots and Lines?
There are 63 questions on Tales by Dots and Lines. Try the 4-question sample quiz on this page first; each answer shows an explanation when you tap it.

Sources & Official References

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

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