Hey people! heres the scribe for Friday.

In class we learned more about independent events and dependent events

**Independent events:** The outcome of one has no affect on the outcome of the other

**Dependent events:**The outcome of the first event affects the probability of the outcome of the second event

An example of a dependent event:

*There are 6 marbles in a bag: 3 red, 1 blue, 1 green and 1 yellow. A)What's the probability of picking a yellow marble?B)What's the probability of picking a blue marble?*

A)The probability of picking a yellow marble is 1 out of 6

B)The probability of picking a blue marble is 1 out of 5

This problem is a dependent event because the sample space changed. The sample space changed because you picked a yellow marble and did not put it back. The outcome of the first event changed the probability of the outcome for the second event.

On the other hand, if you picked up the yellow marble, then replaced it back in the bag, it would be an independent event because the sample space wouldn't change!

AND, here is the sribe for today.

Today in class we learned about mutually exclusive events and not mutually exclusive events.

**Mutually exclusive** events or disjoint events, have no outcomes in common.

an example of a mutually exclusive event:

If you roll a six-sided die once, the events

A = rolling a 2 or a 4

B = rolling a 1 or 3

These are disjoint events because they cannot both happen.

**Not mutally exclusive** when two events are not mutually exclusive, it is possible for them to occur together.

an example of a non mutually exclusive event:

*Consider a two-sided coin and a six-sided die. Let event A be tossing a head and let event B be rolling a 6. The probabily that both A and B occur is*

P(A) X P(B) = (1/2) X (1/6) = 1/12

Since the value is not 0, it is not a mutually exclusive event.

and thats it. Sorry guys if that didnt make any sense! =s. thats all i know. lol.

BUT, the next scribe is NADIYA

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