Thursday, February 19, 2009

Thursday, February 19th, 2009

Well Today...
We started a new unit called Probability.

I'm sure you all know the basic idea behind the word probability, but I'm going to write down a few definitions that we learned today.

* Probability: A measure of the likely hood of an occurrence of an event.

* Sample Space: A list of all possible outcomes.

* Event: A particular outcome within the sample space.

* Simple Event: A result of an experimental probability trial that is carried out in one step.

* Compound Event:A Result of an experimental probability trial that is carried out in more than one step.

* Certain events: an event that has a probability of 1 or 100%

* Impossible Events: As you can guess, it is an event which has a Probability of 0 or 0%.

IMPORTANT : Probability is shown in between 1 and 0. But also remember that probability can be relayed as a decimal, percent or fraction.

If you glance through the slides posted up earlier today, you will see the kinds of things we where looking at. The slides also explain the difference between the two different types of probability:

Theoretical Probability which is the likely hood that an event, or desired outcome, will occur.

Experimental probability, on the other hand is probability defined by DOING something.

An example of that is within the slides that depict what we did today in class. We actually tossed a set of 3 coins 20 times to determine the probability of getting a head to tail ratio of 0:3,1:2,2:1 and 3:0. Because we actually DID the experiment, it makes it experimental probability.
The formulas for finding the two types of probability above are within the slides.

That is about all I have to say about the days events.


The Next Scribe Will Be Chelsea... hope your Internet is up and running again :P


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