To log in and use all the features of Khan Academy, please enable JavaScript in your browser. Video transcript What I want to do in this video is give you at least a basic overview of probability. And that’s the 3. So once again, you have six equally likely possibilities when I roll that die. Well, what are the number of equally likely possibilities? And of the number of equally possibilities, I care about the number that contain my event right here. So the probability of this is actually 0.

It’s asking for some type of way of getting your hands around an event that’s fundamentally random. I know this isn’t the kind of experiment that you’re used to. Well, what are the number of equally likely possibilities? And how many of those meet my conditions? And what’s the number of possibilities that meet my conditions? So now there are two possibilities that meet my constraints, my conditions. What is the probability of rolling a 2 and a 3?

But an experiment is every time you do, you run this random event. And there’s always some chance– even if you flipped a coin a million times, there’s some super-duper small chance that you would get all tails.

And that’s the 3. So the number of possibilities that meet my constraint, that meet my conditions. If I flip it in the air, it’s not more likely to land on one homwwork or the other.

And so if I chapteer to ask you, what is the probability– I’m going to flip a coin. And how many of those meet my conditions? Well, once again, there are six equally likely possibilities for what I can get. But hopefully, this will give you a little deeper understanding. And we’ll talk about different ways of describing that. You could either get heads, or you could get tails.

We’re assuming that the coin can’t land on its corner and just stand straight up. Now, let’s do another very typical example when you first learn probability. I know this isn’t the kind of experiment that you’re used to.

Well, there’s only two possibilities. You know, you normally think an experiment is doing something in chemistry or physics or all the rest. Getting a 2 and a 3 are mutually exclusive events. Video transcript What I want to do in this video is give you at least a basic overview of probability. So now there are two possibilities that meet my constraints, my conditions.

## Intro to theoretical probability

And of course, you have, you know, the different sides of the die. And the other side, ansswers course, is the tails. Statistical significance of experiment. If you take or quarters or pennies, stick them in a big box, shake the homwwork so you’re kind of simultaneously flipping all of the coins, and then count how many of those are going to be heads.

So you can maybe view it as the sides are equal, their weight is the same on either side. Well, what are the number of equally likely possibilities? You can flip a coin.

# Theoretical probability | Statistics and Probability (video) | Khan Academy

cahpter Well, I have six equally likely possibilities. And what’s the number of possibilities that meet my conditions? The other side right over there is tails.

When you roll this, you could get a 1, a 2, a 3, a 4, a 5, or a 6. What percentage of those would give me heads? So how many equally likely possibilities.

We don’t know whether it’s heads or tails, but we can start to describe the chances of it being heads or tails.

Intro to theoretical probability. There are now two possibilities that meet my conditions.