Introduction

• A graphical representation of data helps us in understanding given data at a glance. • Cumulative frequency is sum of frequencies at or below a given value. • A curve drawn with upper limits and cumulative frequency is called an ogive of less than type. • A curve drawn with lower limits and cumulative frequency is called an ogive of more than type.

Pre-Requisites:

• Knowledge of grouped, ungrouped data. • Knowledge of mean, mode, frequency, cumulative frequency.

Activity:

You will observe median is the intersection point of two ogives.

Real Life Question:

Is cumulative frequency graph helpful to find maximum number of admissions in a school?

Key Words / FlashCards

Learning aids / Gadgets

Real life uses :

Cumulative frequency graph is helpful in understanding data and finding median with the help of cumulative graph and this very helpful in statistics.

Places to visit :

Find electricity bills for previous year and note monthly consumption in units. Find cumulative frequency and draw ogive.

Practical examples around us

What you learn in Theory:

Median for grouped data can be formed at the intersection point of less than ogive and more than ogive.

What you learn in Practice:

Managing frequency tabulated data is much simpler. We can easily find median at intersection of two ogives.