Today in class we did more

PROBABILITY.

Here are some of the exercises that we did during class:

a) Choose a student from grade

7 and choose a student from grade

8.

Are these choices

DEPENDANTor

INDEPENDENT on each other?

They are

*independent*. Because the person you choose from

grade 7 has

no effect on the person you choose from grade 8. Therefore they are

*independent*.

b) Choose one marble from a bag, then

without replacing it, choose a second marble from the

same bag.

Are these choices dependant or independent on each other? They are

*dependant* because once you have chosen one marble from the bag, you have

one less marble to chose from when you pick your second one. They have an

effect on each other, therefore they

*dependant*.

When figuring out if the choices you are making are dependant or independent on each other, the question you should as yourself is:

__DOES THE FIRST THING I DO, CHANGE THE SECOND THING I DO?__If the answer is

YES, that means that they are

DEPENDANT.

If the answer is

NO, that means that they are

INDEPENDENT.

HOMEWORK:Make sure you know how to do a

tree diagram, and a

chart to find the

*sample space* of probability problems.

Make sure that

number of the day is finished: today's number was

7835.621Don't forget

TLE tomorrow!

(Please leave your comments and don't be afraid to point out any mistakes I have made so that next time I can do better!)

I choose Caitlin for the next scribepost. :)