Tales by Dots and Lines
CBSE · Class 8 · Mathematics
Practice quiz for Tales by Dots and Lines — CBSE Class 8 Mathematics. MCQs and questions with answers to test your preparation.
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Quick Quiz: Tales by Dots and Lines
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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?
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?
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?
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?
Sample Questions
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
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