Scribepost for March 16

Area

Area- is the number of square units contained in a two dimensional region.

Parallelogram- a four sided figure with opposite sides parallel and equal in length.





Base- side of a two dimensional figure common symbol is b.





Height- the perpendicular distance from the base to the opposite side common symbol is h.





Perpendicular- a line that meet another line at a right or 90 angle.








Remember:


Homework is to find the area of the following figures.

I choose Cole for the next scribepost.

Scribepost for March 16, 2009

Today as usual we did number of the day.
Today's number is 2374.198.
We also review probability.

There are two ways that u could see all the outcomes
One way you could show all the outcomes is to draw a tree diagram.



This is a tree diagram.










This tree diagram explains what the coin rolled.




The other way you could show it is a table chart.

















I believe that we didn't have homework.

I pick Damian for the next scribepost.

Sorry if it was short.

Scribepost for March 12,2009

I am going to do the Scribe post for Thursday because Caitlin was sick.

On Thursday we started by doing what we always start with.Number Of The Day
Thursday's number was 1247.936


On Thursday we had a test about probability. Here are the answers:
1.True 6. A 11.C 16.D 2.False 7. D 12.C 3.False 8.D 13.B 4.False 9.D 14.A 5.True 10.B 15.C

17.Favourable Outcome
18.Outcome
19.Tree Diagram and Probability Chart or Table
20.One Half
21.Tree Diagram
22. 1/25
23.Independent events

24.B 29.
25.A
26.D
27.E 30.They have an equal amount of winning.
28.C

After we did the test we copied some notes about probability.
This is what they said(or at least what I wrote. (= ).
More Probability
P(Rolling Prime Number) with a regular die.

P(Rolling Prime Number)=
Favourable outcome
---------------------------
Possible outcome

P(Rolling Prime Number)= 3/6 we always have to simplify so 3/6 is 1/2, 50% and,1:2

Find the probability of rolling two sixes in a row with a regular die.
You need to use a probability tree to solve this problem.




P(two sixes in a row)=
favourable outcome
----------------------------
possible outcome _
P(two sixes in a row)=1/36,2.78, 1:36

Independent Event- The outcome of one event has no effect on the outcome of another event.

Sample Space- All possible outcomes of an experiment.

Tree Diagram- Diagram used to organize outcomes

Find The possibility of landing a coin on HEADS, and rolling an ODD number.








P(odd and heads) =
favourable outcome
----------------------------
possible outcome
P(odd and heads)=1/4,1:4,25%



I know that the font is too big and messed up but i don't know how to fix it.So im just going to post it like this.


For the next Scribe Post i pick Jex M. But if someone didn't do the Scribe Post yet you should tell me.

Thank you for checking my scribe please leave a Comment.

Scribe post for March 10, 2009

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 7835.621

Don'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. :)

scribepost for march 9 2009

Today in class. We did more probability.
We did some qeustions and notes about probablity.

Notes:

Sample space is the set of all possible outcomes of a random proccess.

Independent events is the outcomeof one event has no effect on the outcome
of another event.


Tree diagram is adiagram used to organized outcome.
-Contains a branch for each possible outcome of an event.

Questions:

What si the probablity of rolling a prime number with a regular die
Answer:1/2 or 50% or 1:2

find the probability of rolling two sixes in a row with a regular die.
Answer: 1/36

Probability of landing a coin on heads and rolling an odd number.
Answer:1/4 or 25% or 1:4


ENJOY!

HOPE YOU LIKE IT............I PICK LAURA TO DO THE NEXT SCRIBEPOST.

Scribe post for march 5, 2009

This math class we did number of the day, probability test , and Mr. Isfeld taught us more about probability

This are the questions of the math test and their answers.

True/False

1. There is an equal probability of picking a red card or picking a black card from a full deck of 52 cards. Answer: true.

2. Using a six-sided die, the probability of rolling an even number is 1:3. Answer: false.

3. Using a six sided die the probability of rolling a 5 or a 6 is 1:2. Answer: false.

4. If there are fewer "favourable outcomes" the probability increases. Answer: false.

5. The formula for determining probability is = all outcomes over favourable outcomes Answer: false.

Multiple Choice

6. The probability that an event happens is 4:12 what is the probability that the event will not happen. Answer: 8:12.

7. What is the probability of drawing a red face card ( i.e., king, queen, or jack ) from a full deck of playing cards?. Answer: 6:52.

8. If you spin this spinner 30 times, how many times might you expect it to land on red?

Answer: 10 times.

9. There are 14 marbles in a bag: 4 red, 4 orange, 5 green, and 1 blue. You take out one marble out of the bag. What is the probability of getting a red or a blue marble? Answer: 5: 14.

10. Each letter of the word PROBABILITY is written on a separate card and placed in a bag. Fareshta draws one card from the bag what is the probability of her drawing a B? Answer: 2:11.

11. A _________ is a successful result in a probability experiment. Answer: favourable outcome

12. The expression "50-50 chance" means a probability of _______ percent. Answer: 50%.

This is an example of probability which Mr Isfeld taught us more about a while ago.

What is the probability of hitting heads while flipping a coin and rolling 3 on a normal six sided die.

probability tree/diagram.

Answer: favourable outcomes

___________________

possible outcomes

= 1: 12.

I pick Owen to do the next scribe post.

Scribe Post, March 4, 2009

Today in Math, we did Number Of The Day, as usual. The Number of the Day is 7791.692. We also continue doing Probability.

Probability continued

Outcome means one possible result of a probability experiment.

Favourable outcome means a succesful result in a probability experiment.

Examples:

The tiles S, N, O, and W are placed in a bag. What is the probability of drawing a letter W from the bag?
Another way to write this question is P(W).

1. P(W) = favourable outcomes
over
possible outcomes

P(W) = 1/4

If they ask you in a sentence you must answer in a sentene too.
The probability of drawing a W is 1/4, 25%, or 1:4.

2. P(S or O) = favourable outcomes
over
possible outcomes

P(S or O) = 2/4

You always need to simplify your answer.

P(S or O)= 1/2

P(S or O) =1/2, 25%, or 1:2

Homework:

The letters M, O, U, N, T, A, I, N are in a bag.


A. Probability of drawing a letter N

B. P(consenants)

C. P(letter)




I pick Charlie to do the next scribe post.