Tales by Dots and Lines — Important Questions
CBSE · Class 8 · Mathematics
63 important questions from Tales by Dots and Lines for CBSE Class 8 Mathematics, with answers. Part of the CBSE Class 8 Mathematics syllabus.
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Important Questions from Tales by Dots and Lines
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?
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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.
A data set contains 10, 10, 11, and 17. What is the mean?
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12
Add the values: 10 + 10 + 11 + 17 = 48. Divide by 4 values: 48 / 4 = 12.
The average of a data set is 12. A new value greater than 12 is added. What must happen to the mean?
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It increases
When a value greater than the mean is added, the balance shifts upward, so the mean increases.
If every value in a data set is increased by 3, and the original mean is 18, what is the new mean?
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21
Adding 3 to every value increases the mean by 3. So the new mean is 18 + 3 = 21.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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