# Probability: Explained

## What is it, how to calculate it, formula, why it's important

Hi there, it's your friendly neighborhood CFO back again with another exciting topic to talk about! Today we'll be diving into the world of probability. Don't worry, I won't bore you with complex math equations and theories. Instead, I'll be explaining probability in the most simple and straightforward way possible.

## What is probability?

Probability is the measure of the likelihood of an event occurring. It's that simple. We use probability in our everyday lives, often without realizing it. For example, we check the weather forecast before heading out, we buy insurance for our homes and vehicles, and we even make decisions based on probability when playing games or betting.

## Types of probability

There are three types of probability - experimental, theoretical, and subjective.

• Experimental probability is based on actual experiments or observations. For example, flipping a coin and recording the number of times it lands on heads or tails.
• Theoretical probability is based on the assumption of equal chance of all possible outcomes. For example, rolling a fair six-sided die.
• Subjective probability is based on personal judgment or opinions. For example, predicting the outcome of a football game.

## Calculating probability

Now let's get into the nitty-gritty of probability. Probability is expressed as a fraction or decimal between 0 and 1, where 0 means the event is impossible and 1 means the event is certain. To calculate probability, we use the formula:
Probability = number of favorable outcomes / total number of outcomes

For example, if we roll a six-sided die, the probability of getting a 4 is 1/6. Why? Because there is only one favorable outcome (getting a 4) out of six possible outcomes (rolling a 1, 2, 3, 4, 5, or 6).

We can also calculate the probability of multiple events occurring together by multiplying their individual probabilities. For example, the probability of rolling a 3 and a 4 in two rolls of a die is 1/6 x 1/6 = 1/36.

## Real-life applications

Probability has countless real-life applications in various industries. In finance, it's used to calculate risk and make investment decisions. In medicine, it's used to determine the effectiveness of treatments and clinical trials. In sports, it's used to predict the outcome of games and tournaments. The list goes on and on.

## Final thoughts

Probability is a fascinating topic that has countless applications in our daily lives. By understanding probability, we can make better decisions, calculate risk, and even improve our chances of winning games. So next time you're playing a game of chess or buying a lottery ticket, remember the power of probability!