Definitions [1]
Definition: Probability of an Event
In Mathematical language, when possibility of an expected event is expressed in number, it is called ‘Probability’. It is expressed as a fraction or percentage using the following formula.
\[ P(A) = \frac{\text{Number of sample points in event } A}{\text{Number of sample points in sample spaces}} = \frac{n(A)}{n(S)} \]
- The Probability is expressed as a fraction or a percentage.
- The probability of any event is from \[ 0 \text{ to } 1 \text{ or } 0\% \text{ to } 100\%. \]
- If \[ E \] is any event, \[ 0 \leq P(E) \leq 1 \text{ or } 0\% \leq P(E) \leq 100\%. \]
Key Points
Key Points: Measurement of Probability
- Probability = possibility of an expected event expressed in number.
- \[ P(A) = n(A) / n(S). \]
- Expressed as a fraction or a percentage.
- \[ 0 \leq P(E) \leq 1, \] i.e. \[ 0\% \text{ to } 100\%. \]
