## Wednesday, March 4, 2009

### ScribePost for March 3, 2009

Today in math class, we did "Number of the Day" with the number as "7791.692".

Afterwards teacher guy went up to the projector, pushed a button, turned it on, made a noise, and showed us some notes to take down.

The notes were on:

First we had to take down some words and their definitions.

Outcome - One possible result of a probability experiment.

Favorable Outcome - A successful result in a probability experiment.

Then he gave us an example with some questions.

"The tiles "S, N, O, W," are placed in a bag.

First question: What is the probability of drawing the letter "W" from the bag?

Another way to write that question is P(W)
(P stands for probability)

P(W) =
favorable outcomes
----------------------------
possible outcomes

So then most of us thought, Hmm, 4 letters, and we only want one of the letters so it must be:

P(W) = 1

---
4

Another way of expressing that is
25%
or
1 : 4

Second Question: What is the probability of drawing a S or an O from the bag? P(S or O) =
favorable outcomes
------------------------
possible outcomes

Now you had to think, 4 letters and we want 2 of them so what are the chances of getting them?

It was, of course,:

2 1
-- simplified as --
4 2
50%
2 : 4

P(S or O) = 1 P(S or O) = 50%
-- or
2
P(S or O) = 1 : 2

Third Question: What is the probability of drawing a consonant from the bag?
P(consonant) =
favorable outcomes
----------------------------
possible outcomes

Since in class, like around 10 people don't know what a consonant is so click that link for the definition.

Anyway, if you know what a consonant is, this is easy since there are 3 conso
nants, "S, N, and W". Three favorable outcomes, and four in total, you should know this by now:

P(consonant) = 3
--
4

Another way to write this is
75%
or
3 : 4

Fourth and last Question for "S.N.O.W.": What is the probability of drawing a "B" from the bag?
P(B) =

favorable outcome
----------------------------
possible outcomes

Really simple if you listened, there are 4 letters, you want to draw "B", but there is no "B", so there is ZERO chance of drawing it. This is not out of 4 because now there are 5 choices:

P(B) - 0
--
5

Another way to write this is
0%
or
0 : 5

After all that stuff, we were given ANOTHER problem.

A bag contains 10 marbles. Show the probability of the following events as a fraction, a ratio, and a percentage.
1. 3 Blue
2. 6 Red
3. 3. Green

A. What is the probability of drawing a red marble?
P(red marble)=
favorable outcomes
----------------------------
possible outcomes

There are 6 red marbles, 10 marbles in total, this is obviously 3 over 5 simplified.
3
--
5
or
60%
or
6 : 10

B. What is the probability of selection a red or blue or green marble?
P(R or B or G)
favorable outcomes
----------------------------
possible outcomes

There are ONLY red, blue, and green marbles in this bag so that makes it a 10 out of 10 chance. -.- STEPHANIE -.-
P(R or B or G)
1
--
1
or
100%
or
1 : 1

C. What is the probability of NOT selecting a red?
P(B or G)=
favorable outcomes
----------------------------
possible outcomes

Your trying not to get a red, so you have to find the probability of all the rest of the outcomes. So add up the amount of blues and greens to get your numerator and the total of all the outcomes as your denominator.
P(B or G)=
4 2

-- simplified --
10 5
or
20%
or
4 : 10

Finally its over!

Homework:

Here are the letters you have to work with:

M.O.U.N.T.A.I.N.

A.What is the probability of drawing the letter "N"?

B.
What is the probability of drawing a consonant?

C.
What is the probability of drawing a letter?

I pick Danielle to do the blog :D

Carla772 said...

Great Job Ronny !
Thats a long post. But i understand it. I liked the colors and the pictures and the links !

Elaine772 said...

Nice job Ronny! I like how you put different colours, pictures, and that you put down everything we did today. Almost everything was understandable but a few things you put down I didn't really understand.

Elaine772 said...

Nice job Ronny! I like how you put different colours, pictures, and that you put down everything we did today. Almost everything was understandable but a few things you put down I didn't really understand.

Anonymous said...

Great job! i'm away so this is very helpful, it gave me a good idea of what you did that class!

Telisa72 said...

Wow your post is colourful but i like it and the picture

MaryJane772 said...

Nice job Ronny. Great use of colour and nice picture. Good job on explaining everything we did in class. I also liked the link.

althea772 said...

good job!
you put lot's of details that we did..and you put colours and pictures to make your post better..well done!

Ralph772 said...

Good Job!!!! You did everything well. You put down all the notes. Good Job!

argie772 said...

good job ronny!!!
everything was done really good.
i liked the pictures, colors, and links.
well good job ronny!!!

Camille5 said...

haha nice job. very funny i think. haha. uhhmm nice colors

stephanie772 said...

Good job Ronny !
That was a really loong post !
I like the colours . its very colourful !

Aldrine772 said...

Nice job ronny!!! i like it how you made the bag and the marbles its really awsome and the dice. great job :)

kevin772 said...

good job !

gilbert772 said...

Good job Ronny! nice blog it was very long and I like the colors and the links you put GOOD JOB again.

Ronny 772 said...

Omg i love your post ronny, your teh bezt

Zerlina 873 said...

Great job Ronny! Nice scribe! It was extremly understandable and I like how you used so many colours. I think you shouldn't put the whole post bold unless it is important information. You also forgot labels.

Anonymous said...

um aldrine you spelled awesome wrong, you forgot the "e" and extremely has an "e" before the "y"