CBSE · Class 6-10

Class 8 · Chapter 5

Data Handling

Reading and drawing bar graphs, pie charts; probability of events.

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Tip: open the NCERT PDF for the original chapter text alongside the notes here.

Detailed theory

Frequency tables, grouped tables with class intervals. Class mark = midpoint of a class.

Key concepts & formulas

01

Pie chart: fraction

= \dfrac{\text{value}}{\text{total}}

; central angle

= \text{fraction}\times 360^\circ

.

02

Frequency distribution: how many times each value occurs.

03

Probability of event

E = \dfrac{n(E)}{n(S)}

.

04

0 \le P(E) \le 1

.

05

P(\text{sure event})=1,\; P(\text{impossible})=0

.