Lesson 10, Topic 5
In Progress

# Impossible and Certain Events

Lesson Progress
0% Complete

#### Topic Content:

• Impossible and Certain Events

1. The total probability of mutually exclusive events = 1, which means the events are certain to happen.

2. The probability of an impossible event is 0. E.g. the probability of obtaining a 9 in a throw of dice is 0, which means it is impossible.

### The Probability that an Event Will Not Happen:Â

If the probability that an event (E) is happening is “P (E happening)”, then the probability that event (E) is not happening is:Â

P (E not happening) = 1 â€“ P (E happening)

### Example 10.5.1:Â

Out of 40 pupils in a class, 10 pupils are wearing glasses. What is the probability that a pupil picked at random will not be wearing glasses?

Solution

No of possible outcomes = 40Â

You are viewing an excerpt of this Topic. Subscribe Now to get Full Access to ALL this Subject's Topics and Quizzes for this Term!

Click on the button "Subscribe Now" below for Full Access!

### Subscribe Now

Note: If you have Already Subscribed and you are seeing this message, it means you are logged out. Please Log In using the Login Button Below to Carry on Studying!

#### Responses

1. I just love koftastudy.
You are the best.
Educative and simple