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📊 Chapter 10: How Quantities Combine: Understanding Data • Exercise Set 10.4

Verified step-by-step solutions for your class notes.

Q1

Based on the IUCN Red List stacked column chart:
(i) What does 14,234 represent?
(ii) Approx how many reptile species in 2016?
(iii) Which class(es) had a small increase between 2007 and 2019?

The Number of Endangered Species is Rising (IUCN Red List) Mammals Reptiles Birds Insects Amphibians Molluscs/Fish/Others 0 3,000 6,000 9,000 12,000 15,000 7,851 2007 9,618 2010 11,212 2013 12,630 2016 14,234 2019
Stacked Column Chart: Number of animal species in the IUCN Red List by class (2007–2019)

Answer:
(i) It represents the total cumulative number of endangered animal species (across all listed classes) in the year 2019.
(ii) Looking at the maroon bar segment for 2016, it spans roughly from 1,000 to 2,000 on the y-axis, indicating approximately 1,000 reptile species.
(iii) 'Mammals' (bottom dark blue bar) and 'Birds' (light blue bar) show relatively small increases over that time period.

Q2

Wickets taken in International Cricket. Complete the given stacked bar charts (the bar lengths can be approximate).

Answer (i) Comparing total wickets taken at home vs. overseas:

Home Overseas 0 100 200 300 Test ODI T20

Answer (ii) Total wickets taken in each format:

Test ODI T20 0 100 200 300 Home Overseas