Tales by Dots and Lines — Class 8 MCQs with Answers
Class 8 CBSE Mathematics · Chapter 12
9 timed quizzes · Easy, Medium and Hard · Updated
Jump to the 6 solved questions
Practise the most important Class 8 CBSE Mathematics questions from Chapter 12, "Tales by Dots and Lines". You get 9 timed quizzes of NCERT-based MCQs, with answers and explanations. The questions are split into Easy, Medium and Hard. Warm up on the basics, then move on to the exam-level questions that top scorers in CBSE Board exams get right.
To score well in "Tales by Dots and Lines", focus on fast problem-solving, formula recall and step-by-step working. Each MCQ here is timed and uses exam-style marking (+4 correct, −1 wrong, 0 skipped). This helps you stay accurate when time is short, just as real papers need. Every question has a short explanation, so a wrong answer becomes a quick lesson. It is the fastest way to fix gaps before a test.
Use this chapter for focused revision. Start with the Easy set to check your basics on Tales by Dots and Lines, then move to Medium and Hard to practise applying them. Your accuracy, streaks and XP save automatically. This chapter also adds to your overall Class 8 Mathematics mastery score. Try the 6 sample questions below: tap an option to see the answer and a worked explanation. Sign in free to start practising.
Tales by Dots and Lines — important questions & MCQs with answers (Class 8 Mathematics)
6 solved questions from this chapter's difficulty levels, each with its answer and explanation. Tap an option to check yourself.
0 of 6 answered
- Q1 of 6Easy
The mean (average) of a set of numbers is found by:
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Answer: adding them and dividing by how many there are
Explanation: Mean = (sum of all values) ÷ (how many values there are). Adding the values without dividing, or picking the middle one, gives a different statistic (the median), not the mean.
- Q2 of 6Easy
The median of a data set is:
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Answer: the middle value when the data is arranged in order
Explanation: The median is the middle value once the data is arranged in order — not the largest value, the total of all values, or the most frequent one, which are different statistics.
- Q3 of 6Medium
The mode of 4, 4, 5, 6, 6, 6 and 7 is:
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Answer: 6
Explanation: Count how often each value appears: 6 occurs three times, more than any other value, so the mode is 6.
- Q4 of 6Medium
On a bar graph, Monday's bar is 20 and Tuesday's is 30. The increase from Monday to Tuesday is:
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Answer: 10
Explanation: The increase is the later value minus the earlier one: Tuesday's 30 − Monday's 20 = 10. Reporting either day's value alone, 20 or 30, is not the increase.
- Q5 of 6Hard
The mean of 10 numbers is 15. If one number, 24, is removed, the mean of the remaining 9 is:
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Answer: 14
Explanation: The original total is 10 × 15 = 150. Removing 24 leaves 150 − 24 = 126 spread over 9 numbers, so the new mean is 126 ÷ 9 = 14.
- Q6 of 6Hard
The median of 4, 7, 2, 9, 5, 3 and 8 is:
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Answer: 5
Explanation: Arrange in order: 2, 3, 4, 5, 7, 8, 9. With seven values, the middle (fourth) one is the median: 5.
Tales by Dots and Lines notes: key concepts (Class 8 Mathematics)
This chapter is about making sense of data with a few well-chosen numbers and pictures. The mean, median and mode are three measures of the centre of a data set: the mean balances the values, the median is the middle value, and the mode is the most common one. The range measures spread. You also read and interpret bar graphs, line graphs and pie charts, choosing the right one for the story the data tells.
- Data
- A collection of facts or numbers gathered about something, which we organise, summarise and display to draw conclusions.
- Mean (average)
- The sum of all the values divided by how many there are; it 'balances' the data. The mean of 4, 6 and 8 is 18 ÷ 3 = 6.
- Median
- The middle value when the data is arranged in order; for an even number of values it is the average of the two middle ones.
- Mode
- The value that occurs most often. A data set can have one mode, more than one (bimodal), or none if no value repeats.
- Range
- The difference between the largest and smallest values; it tells how spread out the data is: range = largest − smallest.
- Measures of central tendency
- Mean, median and mode each describe a typical or central value, and they can differ, so the right one depends on the data.
- Effect of outliers
- A single very large or small value (an outlier) can pull the mean far off, while the median stays close to the middle — the median is resistant to outliers.
- Bar graph
- A chart using bars whose heights show the values; taller bars mean larger values, and double bar graphs compare two data sets.
- Line graph
- A graph joining points with lines, best for showing how a quantity changes over time; a rising line means increasing, a flat line means unchanged.
- Pie chart
- A circle split into sectors, each proportional to its share of the whole; a sector's angle is (value ÷ total) × 360°.
- Frequency
- How many times a particular value appears in the data, used to build frequency tables and histograms of grouped data.
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Tales by Dots and Lines — FAQs
What are the key concepts in Class 8 Mathematics Tales by Dots and Lines?+
This chapter is about making sense of data with a few well-chosen numbers and pictures. The mean, median and mode are three measures of the centre of a data set: the mean balances the values, the median is the middle value, and the mode is the most common one. The range measures spread. You also read and interpret bar graphs, line graphs and pie charts, choosing the right one for the story the data tells. Key ideas include Data, Mean (average), Median, Mode, Range, Measures of central tendency.
What does Class 8 Mathematics Chapter 12 (Tales by Dots and Lines) cover on XamBaaz?+
It has 9 timed quizzes of NCERT-based MCQs on "Tales by Dots and Lines", at Easy, Medium and Hard levels, and you never get the same set twice. Every question has an instant explanation. They help you prepare for CBSE Board exams.
Are these "Tales by Dots and Lines" questions free to practise?+
Yes. Sign in with Google to practise "Tales by Dots and Lines" free. Full unlimited access is ₹999/year. One year from the day you pay. You stay in Class 8 till 31 March; on 1 April your account moves up to Class 9 and the rest of your year carries over. No chapter is charged separately.
How should I revise "Tales by Dots and Lines" for the exam?+
Start with the Easy quiz to check your basics, then try Medium and Hard to practise applying them. There are 9 timed quizzes on this chapter, so you can come back for a fresh set instead of one you have seen. Read each explanation, retry the questions you miss, and track your accuracy until it stays high.
Are these "Tales by Dots and Lines" MCQs available with answers?+
Yes. 6 sample questions are on this page with answers: tap an option, or "Show answer", to see the correct option and a step-by-step explanation. Sign in free with Google to start practising, with instant scoring.
Is there negative marking in the "Tales by Dots and Lines" quizzes?+
Yes. The timed quizzes use exam-style marking: +4 for a right answer, −1 for a wrong one and 0 for a skip. MHT-CET and CBSE board papers have no negative marking. Our mocks for those are scored their way.
What are the important questions from Tales by Dots and Lines (Class 8 Mathematics)?+
The questions that matter most test Data, Mean (average), Median, Mode, Range, Measures of central tendency. This page shows 6 solved important MCQs with answers and explanations. Sign in to practise this chapter as timed quizzes.
Is there an online quiz for Tales by Dots and Lines?+
Yes — Class 8 Mathematics Tales by Dots and Lines has timed online quizzes at Easy, Medium and Hard levels, with instant scoring and a worked explanation on every question. The first quiz on the chapter is free.
Are there question answers and extra questions for Tales by Dots and Lines (Class 8 Mathematics)?+
Yes. This page has 6 solved questions on Tales by Dots and Lines, each with the correct answer and a short explanation. Sign in to practise this chapter as timed quizzes.