# Basic-Probabilities Calculator

Free basic statistic probabilities calculation online. Normal
Probability is the number of occurrence of an event out of possible
outcomes. In statistics, probability calculator is used to calculate the
basic probability problems.

## Normal Probability Calculator

#### Single Event Probability Formula :

Probability of event A that occurs P(A) = n(A) / n(S).
Probability of event A that does not occur P(A') = 1 - P(A).
#### Multiple Event Probability Formula :

Probability of event A that occurs P(A) = n(A) / n(S).
Probability of event A that does not occur P(A') = 1 - P(A).
Probability of event B that occurs P(B) = n(B) / n(S).
Probability of event B that does not occur P(B') = 1 - P(B).
Probability that both the events occur P(A ? B) = P(A) x P(B).
Probability that either of event occurs P(A ? B) = P(A) + P(B) - P(A ? B).
Conditional Probability P(A | B) = P(A ? B) / P(B).
where,
n(A) - number of occurrence in Event A,
n(B) - number of occurrence in Event B,
n(S) - total number of possible outcomes.