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Probability21Begin#...

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Probability21Begin#

Probability 2 1 Begin #



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In a probability model, the sum of all probabilities is $1 .$

Okay, in this case, is that what is the probability of for certain events? So now there are two things that will happen. Okay, In short, there are two types of probabilities. The 1st 1 is the probability off certain event on the probability off north certain events. So the probability of certain event is always been on the probability of North. Certain event is always zero so that if you just aren't you will get this. Think that probability off, even less probability of occurring of northern different is equals to one. So in this particular case, it is asking about the probability off event, which is despite this highlighted part, this black part. Okay, so therefore it is simply but

We're wondering about the probability of an impossible event. Well, let's think of this in terms of the four minute we've set up on the bottom is the number of possible outcomes. So we'll call this number outcomes. However, if something's impossible, that means we'll never land on now. The number on the top is the number of things that fit our possibilities, but none of them are possible. So we're gonna have a zero on the top. So no matter what, our number on the bottom is will have zero over it and zero divided by anything is zero. So the possibility of an impossible event is always going to be zero.

Okay, So the probability of an event if you have us as our sample space and he as our events than probability of our events is equal to the number of outcomes of our events. E which was. They wouldn't notice the note that as and e over the number of outcomes in our sample space, which is n yes.

All right. So for these problems were told that two events are happening at once, 1/4 probability happening event to is one half opportunity of happening. Um So for this one really care about E two, and that was one half. So not happening would be doing the complement of that, so one minus one half, which is equal to one.


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