On the basis of this bar graph, what may be a few questions you may ask your friends?

Question

Homi · Accepted Answer

We can look at the bar graph to find out about India's population over many years.

Step 1 — Reading specific populations

We can ask about the population in any given year. Let us look at the bar for 1981. Its top is at 68.

$\boxed{68 \text{ crores}}$ So, the population in 1981 was 68 crores. This helps us ask questions about population in specific years.

Diagram 1

Step 2 — Finding population increases

We can ask how much the population changed between two years. Let us find the population in 2001. It is 102 crores. Let us find the population in 1991. It is 84 crores. The increase is the population in 2001 minus the population in 1991. $102 - 84$

$\boxed{18 \text{ crores}}$ So, the population increased by 18 crores from 1991 to 2001. This helps us ask questions about population growth in a decade.

Diagram 2

Step 3 — Comparing population growth

We can ask which period had the biggest change. Let us list the increases for each decade. From 1951 to 1961: $44 - 36 = 8$ crores. From 1961 to 1971: $54 - 44 = 10$ crores. From 1971 to 1981: $68 - 54 = 14$ crores. From 1981 to 1991: $84 - 68 = 16$ crores. From 1991 to 2001: $102 - 84 = 18$ crores. The largest increase is 18 crores. This happened from 1991 to 2001.

$\boxed{\text{1991 to 2001}}$ This helps us ask questions about the fastest growth period.

Diagram 3

Step 4 — Finding total population change

We can ask about the total change over the whole period. The population in 2001 was 102 crores. The population in 1951 was 36 crores. The total increase is the population in 2001 minus the population in 1951. $102 - 36$

$\boxed{66 \text{ crores}}$ So, the total increase was 66 crores. This helps us ask questions about the overall change.

Diagram 4

Answer

(i) What was India's population in 1981? (ii) How much did India's population increase from 1991 to 2001? (iii) In which decade did India's population grow the most? (iv) What was the total increase in India's population from 1951 to 2001?

Question 8

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