# Experimental Probability – Formula, Definition With Examples

Updated on January 12, 2024

Welcome to another exciting journey with us at Brighterly, where we make the learning of complex mathematical concepts a fun and engaging process. Today, we embark on a venture into the world of experimental probability, a vital aspect of mathematics that breathes life into numbers through practical, real-world experiences. But what exactly is experimental probability, and how does it differ from theoretical probability? How can we calculate experimental probability, and how is it applicable in our everyday lives? This article aims to answer these questions and more, unraveling the mysteries of experimental probability in an easy-to-understand and approachable manner.

Our trip into the world of experimental probability will cover the core concepts, definitions, and the all-important formula that underpins this fascinating area of mathematics. We’ll take a step back to appreciate the broader context of probability before focusing our lens on experimental probability, understanding its properties and contrasts with theoretical probability. With plenty of examples and practice problems, you’ll have a firm grasp on experimental probability, ready to see and use it in the world around you!

## What Is Experimental Probability?

Probability, as a field of mathematics, often focuses on predicting the likelihood of certain events. However, it’s important to note that there are two main types of probability: theoretical and experimental. In this article, we will zero in on experimental probability.

Experimental probability, also known as empirical probability, is all about actual experiments and real-world observations. The main idea behind experimental probability is that it calculates the chances of an event happening based on the actual results of an experiment. This method of calculation is particularly interesting because it revolves around practical events that have already occurred, rather than theoretical or hypothetical situations.

In experimental probability, we conduct a certain experiment multiple times and observe the number of times a specific event occurs. This might sound quite complex, but we’ll dive into this concept with a greater depth in the upcoming sections, making it easily understandable.

## Definition of Probability

Before we delve into experimental probability, let’s take a step back and understand the basic concept of probability. Probability is defined as a branch of mathematics that measures the likelihood of events to occur. It’s expressed as a number between 0 and 1, where 0 indicates impossibility and 1 signifies certainty.

For example, consider flipping a fair coin. The probability of landing a “heads” is 1 out of 2, or 0.5, meaning there’s a 50% chance to get a “heads”. The same applies to “tails”.

Understanding probability can help us make predictions about the outcomes of a random event and aids in making informed decisions in various aspects of life including gaming, statistics, and even weather forecasting.

## Definition of Experimental Probability

Moving on to experimental probability, it is defined as the ratio of the number of times an event occurs to the total number of trials or times the activity is performed. The experimental probability of an event is calculated by conducting an experiment and recording the results.

For instance, let’s say we roll a dice 100 times, and the number “4” comes up 15 times. Here, the experimental probability of rolling a “4” would be the number of successful outcomes (rolling a “4”) divided by the total number of outcomes (total dice rolls), or 15/100 = 0.15.

In other words, experimental probability is the actual probability obtained from the direct observation or testing during an experiment. Unlike theoretical probability, it doesn’t rely on the inherent nature of the experiment, but rather on the actual data collected.

## Properties of Probability

Understanding the properties of probability can provide us with insights about how probability functions. Here are some of the essential properties:

- The probability of an event ranges from 0 to 1.
- The sum of probabilities of all possible outcomes is always 1.
- The probability of the complement of an event (an event not happening) is 1 minus the probability of the event.
- If two events are mutually exclusive (they can’t occur at the same time), the probability of either event occurring is the sum of their individual probabilities.

These properties provide a foundational understanding of how probability works, whether it’s theoretical or experimental probability.

## Properties of Experimental Probability

The properties of experimental probability are closely tied to those of theoretical probability, but with an emphasis on the data collected through experimentation. Here are the primary properties:

- Experimental probability also ranges from 0 to 1. An experimental probability of 0 means the event never happened in the experiment, and a probability of 1 means the event always occurred.
- As more trials are conducted, the experimental probability tends to approach the theoretical probability, given that the experiment is unbiased. This is known as the law of large numbers.
- Like in theoretical probability, the sum of experimental probabilities of all possible outcomes is 1.

Understanding these properties can greatly aid in interpreting the results of experiments and the likelihood of outcomes.

## Difference Between Theoretical and Experimental Probability

The primary difference between theoretical and experimental probability lies in their calculation and interpretation. Theoretical probability is based on the possible outcomes in theory. It assumes that all outcomes are equally likely, which isn’t always the case in real-world scenarios.

On the other hand, experimental probability is based on actual data collected from performed experiments. It deals with the frequency of occurrence of an event, providing a more empirical perspective on probability. For example, in theory, the probability of rolling a “6” on a fair die is 1/6. However, in an actual experiment of, say, 60 rolls, we might roll a “6” only 8 times. The experimental probability then becomes 8/60 or 0.1333.

## Formula of Experimental Probability

The formula of experimental probability is quite straightforward:

`Experimental Probability = Number of times event occurs / Total number of trials`

By using this formula, we can calculate the experimental probability of an event based on the results of an actual experiment or observation.

## Understanding the Formula of Experimental Probability

To understand the formula of experimental probability, let’s revisit the dice rolling example. If you roll a die 100 times, and the number “4” comes up 20 times, then the experimental probability of rolling a “4” is:

`Experimental Probability = Number of times event occurs / Total number of trials `

`Experimental Probability = 20 / 100 = 0.2`

Hence, based on the results of this experiment, the experimental probability of rolling a “4” is 0.2 or 20%.

This formula essentially calculates the frequency of occurrence of an event in an experiment, providing a realistic interpretation of probability.

## Calculating Experimental Probability Using the Formula

Let’s consider another example to illustrate the calculation of experimental probability using the formula. Imagine you’re shooting basketball hoops. You take 30 shots and make 18 of them. What’s the experimental probability of making a shot?

Applying the formula, we get:

`Experimental Probability = Number of times event occurs / Total number of trials `

`Experimental Probability = 18 / 30 = 0.6`

So, the experimental probability of making a shot, based on this experiment, is 0.6 or 60%.

## Practice Problems on Experimental Probability

To better understand how to calculate experimental probability, let’s work through some practice problems:

- A spinner with 8 equal sections numbered 1 to 8 is spun 50 times. The number 3 comes up 7 times. What is the experimental probability of the spinner landing on 3?
- In a school, a survey of what pet each student has at home is conducted. Out of 200 students, 45 have dogs. What is the experimental probability that a randomly selected student has a dog?
- In a bag of 100 marbles, 25 are red, and the rest are blue. If you randomly select a marble, replace it, and repeat this 100 times, and you get a red marble 28 times, what is the experimental probability of drawing a red marble?

Answers:

- Experimental Probability = 7 / 50 = 0.14
- Experimental Probability = 45 / 200 = 0.225
- Experimental Probability = 28 / 100 = 0.28

## Conclusion

And that wraps up our enlightening exploration of experimental probability! With Brighterly, we’ve unpacked this fascinating mathematical concept, revealing its significance and wide-ranging applications in our everyday life. Experimental probability, with its basis in real-world observations, lends us the power to anticipate outcomes based on our experiences, paving the way for more informed decision-making.

From understanding the basic definition of probability to distinguishing between theoretical and experimental probability and mastering the formula of experimental probability, we hope you’re now well-equipped to navigate the captivating world of probability. Remember, probability isn’t just a concept confined within the pages of a mathematics textbook; it’s very much a part of the world around us, informing everything from weather forecasts to game strategy and risk analysis.

So, the next time you play a game of cards, shoot hoops, or even make a decision based on certain outcomes, remember the role of experimental probability! As always, the team at Brighterly is dedicated to making the learning of complex concepts enjoyable, ensuring you have fun on your journey of exploration. Stay tuned for more exciting math adventures!

## Frequently Asked Questions on Experimental Probability

### What is experimental probability?

Experimental probability is a probability value that is based on actual experiments or observations. In other words, it’s a type of probability that quantifies the ratio of the number of times an event occurs to the total number of trials or times an activity is performed. For example, if you flip a coin 100 times and it lands on heads 45 times, the experimental probability of getting heads is 45/100 = 0.45 or 45%.

### How do you calculate experimental probability?

Calculating experimental probability is straightforward. It involves dividing the number of times an event occurs by the total number of trials. For instance, if you roll a die 60 times and get a ‘6’ on 10 occasions, the experimental probability of rolling a ‘6’ would be 10 (number of successful outcomes) divided by 60 (total number of outcomes), which equals 0.1667 or 16.67%.

### What is the difference between theoretical and experimental probability?

Theoretical probability and experimental probability differ in their calculation and interpretation. Theoretical probability is a type of probability that assumes that all outcomes of an experiment are equally likely. It’s calculated by dividing the number of favorable outcomes by the total number of possible outcomes.

On the other hand, experimental probability doesn’t rely on the assumption of equally likely outcomes but instead depends on actual data collected from conducted experiments. It deals with the frequency or proportion of times an event occurs based on experimental data.

### Why is experimental probability important?

Experimental probability plays a crucial role in various fields and everyday life. Its importance lies in its basis on real-world data, which makes it a practical tool for predicting the likelihood of outcomes based on past experiences. Experimental probability is utilized in various sectors such as statistics, data analysis, gaming, weather forecasting, and in the medical field, among others. It also plays a key role in empirical research, where it aids in providing evidence-based conclusions.