Exercise Set 10.4 Chapter 10 Class 9 Maths Ganita Manjari Part 2

 

Ganita Manjari – Class 9 Maths, Part II

Exercise Set 10.4 — Questions with Solutions

Question 1

The following stacked column chart shows the number of animal species in the IUCN Red List, by class, over time.

1. What does the number 14,234 on the top of the column for 2019 represent?
2. Approximately how many reptile species were in the list in 2016?
3. Which class(es) of species have seen a relatively small increase in count between 2007 and 2019?

Stacked column chart: Endangered animal species

Note: The total figures printed in the textbook are exact. The individual coloured segment heights in this recreated diagram are approximate because the textbook chart does not provide exact values for each class.

Solutions

(i) The number 14,234 represents the total number of animal species listed in the IUCN Red List across all the classes shown for the year 2019.

Answer (i): 14,234 animal species in total in 2019.

(ii) Read the reptiles section of the 2016 column (the reptiles band is near the bottom of the stack). Its height is approximately around 1,000 species.

Answer (ii): Approximately 1,000 reptile species.

(iii) Compare the thickness of each class's coloured band in 2007 and 2019. The mammals and reptiles bands show relatively small increases compared with several of the other classes.

Answer (iii): Mammals and reptiles (approximately, as read from the chart).

Question 2

The wickets taken by a bowler in International Cricket till 2025 are shown in the table. Complete the stacked bar charts (bar lengths can be approximate).

Venue	Test	ODI	T20
Home	62	100	32
Overseas	172	49	71

1. Compare the total wickets taken at home vs. overseas.
2. Show the total wickets taken in each format.

Solutions

First, calculate the totals.

Home total = 62 + 100 + 32 = 194 wickets

Overseas total = 172 + 49 + 71 = 292 wickets

(i) Stacked bar chart: Home vs. overseas

Explanation: Each bar is divided into Test, ODI and T20 segments. The full bar length shows the total wickets for that venue.

Answer (i): Home = 194 wickets; Overseas = 292 wickets. The bowler took 98 more wickets overseas (292 − 194 = 98).

(ii) Stacked bar chart: Wickets in each format

Answer (ii):

• Test: Home 62, Overseas 172; total = 62 + 172 = 234 wickets.
• ODI: Home 100, Overseas 49; total = 100 + 49 = 149 wickets.
• T20: Home 32, Overseas 71; total = 32 + 71 = 103 wickets.

Blogger tip: Open your post in HTML view and paste the code from this file. The charts are SVG, so their axes, labels and bars stay sharp when resized. On narrow screens, chart areas can be scrolled horizontally.