Q.How does the procedure of drawing a histogram differ when class intervals are unequal in comparison to equal class intervals in a frequency table?

Frequency Distribution: From Everyday Chaos to Economic Order

Imagine you walk into a bustling market in your city. You see hundreds of people — some buying vegetables, some selling clothes, some just passing through. If someone asked you, "What kind of crowd is here?", you wouldn't list every single person's age, income, or purpose. That would be useless noise.

Instead, you'd naturally group them: "Most people seem to be in their 20s and 30s, a fair number of older folks, and very few children." You've just created a frequency distribution in your head — you've taken raw, chaotic data and organised it into meaningful groups.

The Precise Meaning

A frequency distribution is a table (or graph) that shows how often each distinct value or group of values occurs in a dataset. It answers the question: "How many observations fall into each category?"

In Economics, this is how we make sense of raw data — whether it's household incomes, prices of goods, or exam scores of students.

The Two Types You Must Know

1. Individual (Ungrouped) Frequency Distribution — When data has few distinct values. For example, the number of siblings of 20 students: 0, 1, 1, 2, 0, 1, 3, 2, 1, 0, 1, 1, 2, 0, 1, 2, 1, 0, 1, 1. You'd make a table:

2. Grouped Frequency Distribution — When data has many different values, you group them into class intervals. This is what you'll use most in Economics. For example, monthly incomes of 50 households in a village:

Here, "0 – 5,000" is a class interval, and "8" is its frequency.

Why This Matters in Economics

Economics is about patterns in human behaviour — spending, saving, earning, producing. You cannot see patterns in a jumble of numbers. A frequency distribution reveals them.

Example: Understanding Poverty

Suppose you have income data for 1,000 families. Raw data tells you nothing. But a frequency distribution with class intervals like ₹0–₹5,000, ₹5,000–₹10,000, etc., immediately shows you how many families fall below the poverty line. This single table can guide government policy on subsidies, tax rates, and welfare schemes.

Example: Analysing Market Demand

A shopkeeper records daily sales of a product for 30 days. A frequency distribution of sales volumes tells her which price range or quantity sells most often — directly informing her inventory decisions.

Key Terms You Must Master …