CBSE · Class 6-12

Class 9 · Ganita Manjari

Unit 7 · Class 9Ganita Manjari

The Mathematics of Maybe: Introduction to Probability

Chance, experimental probability, and simple events.

Lessons

3 concepts

1
Classical Probability
Assume all outcomes equally likely. Total sample space size in denominator, favourable count in numerator.
2
Sample Space Examples
Coin toss: $\{H, T\}$ . Die: $\{1,2,3,4,5,6\}$ . Two coins: $\{HH, HT, TH, TT\}$ .
3
Complement
For die roll: $P(\text{even}) = 3/6 = 1/2$ ; $P(\text{not even}) = 1/2$ . Very useful when direct count is hard.

Skills to practise

Skill · medium

The Mathematics of Maybe: Introduction to Probability — Practice