Review: Connecting The Dots — Ganita Prakash: Class 7 Mathematics, Part 2 (NCERT)

What You Can Do Now

Tick what you can now do with data.

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After this chapter, I can…

Chapter in One Card

The chapter's key ideas at a glance.

Connecting the dots (Textbook p. 134)

Dot plots show the minimum, maximum, range, and how data clusters or spreads, at a glance.

Mean = sum of the values ÷ number of values.

Median = the middle of the sorted data; with an even count, the average of the two middle values.

Describe and compare data with min, max, total, range, mean and median.

Clustered bar graphs compare values across categories and across time.

Looking closely at data raises new questions.

Key Terms From This Chapter

Flip through the chapter's key words.

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Questions From the Whole Chapter

Eight questions from quick recall to harder reasoning.

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Mean of 4, 8, 6, 10, 7?

Step-by-Step Challenge Problems

Three mixed problems with guided steps.

Solve each problem step by step

Two runners' 100 m times (s): Asha 16, 17, 15, 16, 16; Bela 18, 15, 14, 17, 16. Compare them.
Books read by 8 friends: 2, 3, 3, 4, 5, 5, 6, 30. Find the mean and median. Which is the better 'typical' value?
A batter scores 45, 0, 12, did not bat, 60, 3. Find the mean and median.

Runners: means, and how they differ

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Same mean? Who varies more?

Books: mean, median, and which is typical

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Look for an outlier.

Batter: mean and median

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Zero vs did not bat.

Solve It Yourself

Four problems from the chapter, no hints.

Solve each problem

Mean school enrolment of 1555, 1670, 1750, 2013, 2040, 2126. (Textbook p. 101, Q5)
Median onion price in Yahapur and in Wahapur. (p. 112, Q1)
Short stories read: mean and median, with and without the 40. (p. 107)
Tally the superpower answers for both grades and describe the difference. (p. 124, Q2)

Mean enrolment

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Onion medians

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Stories

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Superpowers

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Talk it through: data doubts

Stuck on mean, median or a graph? Ask here.

Learners can ask follow-up questions and keep the thread going.

Ask me anything from this chapter: when to use the mean and when the median, how an outlier moves the mean, whether to count a 0 or a 'did not play', how to read the scale on a double bar graph, or whether a claim really follows from a graph. Tell me what you're working on and I'll help you think it through.

almost 3 years ago