Question

Question 2 The following data on the number of girls (to the nearest ten) per thousand boys in different sections of Indian society is given below.

Section Number of girls per thousand boys

Scheduled Caste (SC) 940
Scheduled Tribe (ST) 970
Non SC/ST 920
Backward districts 950
Non-backward districts 920
Rural 930
Urban 910

(i) Represent the information above by a bar graph.
(ii) In the classroom discuss what conclusions can be arrived at from the graph.

Class 9 - Math - Statistics Page 258"

Answer 1

ii) From this graph we infer that the number of girls per 1000 boys is maximum for the ST section, while it is the least in the urban section. The number of girls in Non - SC/ST section is equal to the number of girls from Non backward section.

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Answer 2

In bar graph, bar of uniform width are drawn with equal spacing between them on one Axis with various Heights.
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Solution:

i)
We draw the bar graph of this data, note that the unit in the second column is number of girls per 1000 boys.

a)
We represent the section on the horizontal Axis using any scale .
Let one section be represented by one unit.

b)
We represent the number of girls per 1000 boys on the vertical Axis .
Here, we can choose the scale as 1 unit =10.

Now the graph is as shown in the attachment.

ii)
From the graph, we observe that in scheduled tribe( ST) there is maximum number of girls among different sections of Indian society i.e 970.

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