How to use the probability calculator?

  • Enter the number of events that occurred n(E).
  • Enter the number of possible outcomes n(T).
  • Click the “calculate” button.
  • Use the reset button to enter new values.

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Probability Calculator

Probability calculator

Probability calculator evaluates the probability of occurring events out of total number of possible outcomes. This event probability calculator finds single-event probability. For example; a coin is tossed 90 times and we have to calculate the chances of occurring head in the 1st five times.

What is probability?

Probability is simply how likely something is to happen. It is the outcome of a random event i.e. if we toss a coin we cannot say what will be the result whether it will be head or tail until the event happens. The probability ranges between 0 and 1.

If the probability of an event is 0.6 then it means there is a 60% chance of happening that event. The probability theory contains some sub-terms in it, to understand the concept of probability first we have to go through these basic terms.

  • Experiment: To find well-defined outcomes we do experiments.
  • Trial: The term “trial” represents how many times an experiment is performed.
  • Outcome: It is the possible result.
  • Sample space: All the possible results together make a sample space. It is represented by curly brackets {}.
  • Event: The sample space is a set, and all of its subsets are known as events.

The formula of probability:

The general formula to calculate the single event probability is as follows:

Probability = number of events occurred n(E) / number of possible outcomes n(T)

How to calculate probability?

We can calculate the probability of a sample space by following the below steps.

  • Check the number of all possible outcomes n(T)
  • Find out the number of events that occurred n(E)
  • Divide n(E) by n(T)

To understand the method more precisely, have a look at the following examples.

Example 1:

A fair die is rolled one time, what are the chances of coming the face 6?


Step 1: Check the number of all possible outcomes n(T)

A die has six faces so n(T) = 6

Step 2: Find out the number of events that occurred n(E)

The die is rolled one time so n(E) = 1

Step 3: Calculation

Probability = n(E) / n(T)

Probability = 1/6

Probability = 0.1667

Probability = 16.67%


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