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## Definition:

The chance of an event to happen is called a **probability**. An event can be simple or compound.

## Summary:

The probability of an event P (E) can be determined by two factors:

- number of times an event happens (N)
- total number of possible outcomes (O)

Mathematically, P (E) = N/O

P (E) can also be represented using a line called **probability line. **In a probability line, 0 represents an **impossible event** while 1 represents a **certain event**. P(E) can only occur between 0 and 1.

Probability can also be expressed as a fraction, as a decimal and as a percentage.

## Example:

I’m tossing a coin! What is the probability that the coin lands on tail?

Since the coin can only land on tail, N = 1. There are two possible outcomes (coin landing on heads or on tail), so O = 2.

Hence, P (E) is ½ or 0.5 or 50%.

## Understanding the probabilities of Simple and Compound events Worksheets

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