The two graphs can also be combined into a single graph. We just draw the bars side by side! Verify if the data in the table matches the graph below. Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Yahapur 25 24 26 28 30 35 39 43 49 56 59 44 Wahapur 19 17 23 30 38 35 42 39 53 60 52 42 0 10 20 30 40

Yes, it matches. Check the two bars of each cluster against the two rows of the table, month by month. Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Yahapur (₹) 25 24 26 28 30 35 39 43 49 56 59 44 Wahapur (₹) 19 17 23 30 38 35 42 39 53 60 52 42 Taller bar Y Y Y W W = W Y W W Y Y Three quick checks that catch most mistakes: June — the only month where the two bars are exactly level. Both towns are at ₹35. The tallest bar of all is Wahapur in October, ₹60, just past the 6th gridline. The shortest bar is Wahapur in February, ₹17, well below the 20 line. Why it happens: the two separate graphs held exactly the same numbers, but you had to look from one page to the other to compare a month. Putting the bars side by side means the comparison for each month happens in one glance. Tip: the dots and slanted lines drawn inside the bars are not decoration. They let someone who cannot easily tell the two colours apart still read the graph, and they survive photocopying in black-and-white.

NCERT Solutions for Class 7th Maths Chapter 5 In-text Questions — Visualising Data

Book page 114 – 115 Updated on2026-09-19

Q1.

The two graphs can also be combined into a single graph. We just draw the bars side by side! Verify if the data in the table matches the graph below.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Yahapur	25	24	26	28	30	35	39	43	49	56	59	44
Wahapur	19	17	23	30	38	35	42	39	53	60	52	42

The table of monthly onion prices and the clustered column graph drawn from it — pages 114–115.

Answer

Yes, it matches. Check the two bars of each cluster against the two rows of the table, month by month.

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Yahapur (₹)	25	24	26	28	30	35	39	43	49	56	59	44
Wahapur (₹)	19	17	23	30	38	35	42	39	53	60	52	42
Taller bar	Y	Y	Y	W	W	=	W	Y	W	W	Y	Y

Three quick checks that catch most mistakes:

June — the only month where the two bars are exactly level. Both towns are at ₹35.
The tallest bar of all is Wahapur in October, ₹60, just past the 6th gridline.
The shortest bar is Wahapur in February, ₹17, well below the 20 line.

Why it happens: the two separate graphs held exactly the same numbers, but you had to look from one page to the other to compare a month. Putting the bars side by side means the comparison for each month happens in one glance.

Tip: the dots and slanted lines drawn inside the bars are not decoration. They let someone who cannot easily tell the two colours apart still read the graph, and they survive photocopying in black-and-white.

Q2.

What is the scale used in this graph?

The clustered column graph on page 115.

Answer

1 unit length = ₹10 per kg. The vertical line is marked 0, 10, 20, 30, 40, 50, 60.

Gridlines at 0, 10, 20, 30, 40, 50, 60
Gap between two gridlines = ₹10
Highest gridline needed = 60, because the largest price is ₹60 (Wahapur, October)

Why this scale: the prices run from ₹17 to ₹60. A scale of 1 unit = ₹10 needs only 6 gridlines, which keeps the graph short, and still lets you read a bar to the nearest rupee or two by eye. A scale of 1 unit = ₹1 would need 60 lines; a scale of 1 unit = ₹50 would squash every bar into one or two units and hide all the differences.

Tip: always state the scale before you read any value off a bar graph. A bar reaching halfway between the 30 and 40 lines means ₹35 on this scale — but ₹350 if the scale were 1 unit = ₹100.

Q3.

Is it now easier to compare month-wise prices in both places?

Answer

Yes — much easier.

The two bars of a month touch each other, so which town was dearer that month is settled without measuring anything.
The size of the gap between the two bars shows by how much. In May the gap is large (₹8); in June there is no gap at all.
Reading left to right, you can follow how the difference itself changes over the year: Yahapur ahead in Jan–Mar, Wahapur ahead through most of the middle of the year, Yahapur ahead again in November.

Why it happens: with two separate graphs your eye has to remember a bar height while it travels to the other graph — and memory for heights is poor. Putting the bars next to each other turns a memory task into a direct comparison. This is why the arrangement is called a clustered column graph, or a double column graph when there are two bars in each cluster.

What it still does not tell you: the graph shows each month separately, so the yearly totals and averages are not visible. To answer "which town is dearer overall?" you must go back to the numbers.

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