Bar & pie charts

Bar & Pie Charts

Quick & Easy Guide for Patwari / Lekhpal Students
(Quantitative Aptitude – Manipur Patwari / Lekhpal Program)

1. What is a Chart?

A chart is a picture that shows numbers.

• Bar chart – shows how big each group is.
• Pie chart – shows how each group shares a whole.

2. Bar Chart

2.1. Everyday Analogy

Think of a height chart: each bar is a person’s height. The taller the bar, the taller the person.

2.2. How to Read It

1. Look at the X‑axis (bottom). It lists the groups (e.g., villages).
2. Look at the Y‑axis (left). It shows the numbers (e.g., number of land parcels).
3. Find a bar that matches the group.
4. Read its height – that is the value for that group.

2.3. Tiny Example

Bar chart:

15 |          █
14 |          █
13 |          █
12 |   █      █
11 |   █      █
10 |   █      █
 9 |   █      █
 8 |   █   █  █
 7 |   █   █  █
 6 |   █   █  █
 5 |   █   █  █
 4 |   █   █  █
 3 |   █   █  █
 2 |   █   █  █
 1 |   █   █  █
   +----------------
     A   B   C

2.4. Quick Tips

• Label both axes.
• Give the chart a title.
• Use different colors for each bar if you want.
• Keep the bars evenly spaced.

3. Pie Chart

3.1. Everyday Analogy

Imagine a pizza.

• The whole pizza is 100%.
• Each slice shows how much of the pizza is a particular topping.

3.2. How to Read It

1. Find the slice that represents the group.
2. Look at the percentage written on the slice (or read the legend).
3. That percentage tells you how much of the whole the group is.

3.3. Tiny Example

Suppose a village has 100 land parcels.

• 40 are paddy
• 30 are wheat
• 20 are maize
• 10 are other crops

Pie chart:

          ┌─────40%─────┐
          │  Paddy     │
  30% ────┤  Wheat     ├────── 20%
          │  Maize     │
          └─────10%─────┘

(You can draw a circle and cut it into four slices:

• 40 % for paddy,
• 30 % for wheat,
• 20 % for maize,
• 10 % for others.)

3.4. Quick Tips

• The whole circle = 100%.
• Each slice is a portion of the whole.
• Use a legend if you have many slices.
• Keep the slices clear – don’t mix colors.

4. When to Use Which?

5. Mini Practice Problem

Question:
A village has 60 land parcels.

• 25 are paddy
• 20 are wheat
• 10 are maize
• 5 are other crops

1. Draw a bar chart for the numbers.
2. Draw a pie chart for the percentages.
3. Which crop uses the most land?

Answer

1. Bar chart:

25 | █
20 | █
15 | █
10 | █
 5 | █
   +---------
     P  W  M  O

2. Pie chart:

• Paddy 25/60 ≈ 42%
• Wheat 20/60 ≈ 33%
• Maize 10/60 ≈ 17%
• Other 5/60 ≈ 8%
  (Slice each accordingly.)

3. Paddy uses the most land (42%).

6. Quick Recap

Final Thought

Think of charts as pictures of numbers.

• Bar = tall vs short.
• Pie = slice of a whole.

Use them to make data easier to understand and remember!