# Probability Calculator - Calculatorall.com

Use this probability calculatorr for determining probabilities of two events and probability of normal distribution. Each probability calculatorr shows all the probabilities possible.

#### Probability of Two Events

 Probability of event A: P(A) a number between 0 and 1 Probability of event B: P(B) a number between 0 and 1

#### Probability of a Normal Distribution

 Mean: (µ) Standard Deviation (σ): Left Bound (Lb): For negative infinite, use -inf Right Bound (Rb): For positive infinite, use inf

Probability Of Two Events

Probability refers to the likelihood whether or not an event will occur. It can be any number falling between 0 and 1 where 1 signifies certainty while 0 signifies that an event won't occur. It also follows that if the probability of an event is higher, it will be more certain to occur. Generally, probability is defined as desired outcomes of an event divided by its total outcomes. It is also affected by the independence and mutual exclusiveness of the events that are being studied among several other things. This probability calculatorr can be used for determining probability of two events that one of them won't occur, event A and/or event B occur in case when they aren't mutually exclusive, both the events occur, and that either of the two events occur but both do not occur together.

What Is Normal Distribution?

The Gaussian Distribution or Normal Distribution refers to continuous probability distribution which follows function of: where refers to the mean value while refers to variance. It should also be kept in mind that the standard deviation is usually denoted by . Furthermore, in special case in which = 1 and = 0, the distribution becomes standard normal distribution. Normal distribution is used often for describing and approximating a variable which forms a cluster around mean value. For instance, heights of the male students from a college, scores of test, leaf sizes for any given tree, etc. The normal distribution calculator given here can be used for determining an event's probability whose normal distribution lies between 2 given values. For instance, probability for height of some male student lies between five and six feet. Here, finding P involves standardizing desired values to z-score. This means given mean is to be subtracted and then divided by standard deviation. It also involves the use of Z-table for finding probabilities of Z.

How This Probability Calculator Works?

The probability calculator page features two different calculators. One of them tells you the probability of two events while the other can be used for determining probability of normal distribution.

The first probability calculator requires you to enter probability of two events A and B. Remember it should be any number between 0 and 1. So, just enter the two probability values and the calculator will tell you different possible probabilities of two events as described above. You get probability values for cases when event A doesn't occur, when event B doesn't occur, when event A and/or event B occur, when both the events occur, and when either of the two events occurs but not both of them.

The second probability calculator that can be used for determining probability of normal distribution requires you to enter the Mean value, Standard Deviation, Left Bound value and the Right Bound value. While specifying left bound value, you can use '- inf' to mention negative infinite. Similarly, when you have to enter the right bound value, you can use 'inf' to mention positive infinite. Once all the values have been provided, hit the calculate button and the calculator will tell you the probability between the provided left bound and right bound values, the probability of left bound or less and the probability of right bound or less.

So, if you have to find out any of these probabilities for events or for the normal distribution, you can rely on the results from this probability calculator.