Probability Calculator
Calculate probabilities for various events and distributions with our easy-to-use calculator.
Two Events Probability Calculator
Normal Distribution Calculator
Understanding Probability Calculations
Probability is a measure of the likelihood of an event occurring, expressed as a number between 0 and 1. A probability of 0 indicates impossibility, while 1 indicates certainty.
Two Events Probability
When calculating probabilities for two events, we consider several key concepts:
- Intersection (AND): The probability of both events occurring
- Union (OR): The probability of either or both events occurring
- Exclusive OR (XOR): The probability of exactly one event occurring
- Complement: The probability of an event not occurring
Normal Distribution
The normal distribution is a continuous probability distribution that follows a bell-shaped curve. It's characterized by:
- Mean (μ): The center of the distribution
- Standard Deviation (σ): A measure of spread from the mean
- Empirical Rule: Approximately 68% of data falls within 1σ, 95% within 2σ, and 99.7% within 3σ of the mean