This topic introduces the rule of addition and mutually exclusive events.

Lesson 1 of 3: Learning Outcomes

At the end of this lesson, you should be able to

• calculate probabilities using rule of addition
• determine what is mutually exclusive events

Lesson 2 of 3: Rule of Addition & Mutually Exclusive Events (20 mins)

General Rule of Addition

• Rule of Addition
• Venn Diagram

Example:

A sample of 200 tourists shows 120 went to the Zoo, 100 went to Sentosa and 60 visited both. What is the probability they visited either of attractions?

Mutually Exclusive Events

• Mutually Exclusive Events
• Venn Diagram

Example:

A check of 4000 boxes of chocolates packaged in past month is shown. What the probability of a box being overweight or underweight?