Normal Probability Calculator

   
   

Single Event Probability

Number of possible outcomes 
Number of events occured 

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).

where,
n(A) - number of occurrence in Event A,
n(S) - total number of possible outcomes.

Multiple Event Probability

(A & B are mutually exclusive events)
Number of possible outcomes 
Number of event occurs in A 
Number of event occurs in B 

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.