RAQUEL'S SCRIBEPOST FOR PROBABILITY

TODAY, during math class we did probability. Now, in the beginning we had to tell Mr.Harbeck what we already know about probability. These are the kind of things that we said..
-chance
-dice
-cards
-coins
-percent
-ratios
-probability trees.

AFTER, we did that we talked about the types of probability. Such as,

Theoretical Probability
-what the math says SHOULD happen.
TP= favourable outcome over total possible outcome.
exp.
A COIN P(h) = head over head/tails.
= one half
So, There is a 50% probability by that the flip will be a head.

Experimental Probability
EP= favourable outcome over number of events
exp.
So, what we did was we flipped a coin about 11 times and we put those things in a ratio type form which looked like this..












P(h)= 7 over 12
= 0.583
= 58.3%
The experimental probability of a head was 58.3%

*to achieve a # closer to theoretical probability, you need to do more experiments.
AFTER, we did that we started talking about Probability Trees,
A COIN= H,T 2 Outcomes
A DICE= 1,2,3,4,5,6 6 Outcomes

P(t , >) = 3 over 12
= 25%
There is a 25% probability that there will be...
THE END!
So, that's pretty much it for today's math class ( May 10, 2010 )
For homework we have to do the table and the homework book ( page 124, 125, 126. )
Thaanks for reading, I hope you enjoyed it! Remember to COMMENT. ;)

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Scribepost for February 19.

question 4.

question 5.

question 10.

b.) What object does each net form?

They both form a triangular prism.

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Kim's Percent Scribe

** ALWAYS REMEMBER, WHATEVER YOU DO TO ONE SIDE OF THE TABLE,
YOU ALSO DO TO THE OTHER**

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Christine's Scribepost for Feb. 3

I couldnt do the second question in a ratio table . I forgot how to do it and when my friend wrote it for me.. I lost the paper . & I couldnt find the percent video . sorry (:

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Jarret8-73 Percents,3 Questions

Jarret's percent scribepost(;

Today in class Mr.harbeck told us to post 3 questions we did for percents.

1.4.99 + 4.99 + 3.99 + 19.99= $33.96 x 1.12= $38.0352

2.19.99 x 3 =59.97 x 1.11=
$66.5667

A)7/10 %

B)3/5%

C)101/4 %

D.245%

PLEASE COMMENT(; And if i am wrong pleaase do correct me(; please and thanks.

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Caitlin T's Scribepost for February 3, 2010

Sorry they are pictures but it's easier for me to do. And sorry if I answered or made a mistake during the ratio tables.


OOH! one more thing if you see I was mistakened I put the percent first instead of the other number. [I was in a rush after school ]

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Hannah's scribepost for February 3, 2010

question 6.

A store discounted items by 50% off the original price one week. The following week and additional 10% was taken off the already reduced price. The regular price of a CD player is $85.00. What is the reduced price in the second week?

First we find 50% of $85.00 and subtract it from the original price.

50% is 42.50. We take that away from the original price because it's the discount.

So the selling price for the first week is $42.50

$42.50 is now our new 100%. We now have to find 10% discount of that. Instead of finding 10% and subtracting it from the total, a shorter way is to just find 90%. Because 100% take away 10% equals 90%. Using this method, you will be able to skip one step which is subtracting. This will also save you time.

The selling price after the second week is $38.28

question 8.

Represent the percent on each statement on a hundred grid.

a) 79.1% of all the students are right handed.

b) The average person in Canada uses about 223% as much water per day as the average person in France.

c) The school enrollment increased by 0.8% this year.

question 9.

I'm sorry, it's late.

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Amiel's Scribe for feb 3,2010

Key ideas

percents can be combined by adding to solve a problem 5%+7%=12% .to calculate the increase of a # .you can add the combined percent amount to the original # .percents of percents can be used to determine amounts that result from consecutive percent increase or decrease .you can multiply the original # by a single percent greater than 100 [eg. 112% of 100= 1.12x 10 = 112

THE FINAL SALE

3. 1st I found 10% then add it to 100 . Then I found 15% then added all of my answers together which gave me 100.25

Now just find 25% of 100 then add it to 100.25.

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Camille's scribepost for Feb. 2

Foldable

KEY WORDS


• Percents can be combined by adding to solve problems. 5% + 7% = 12%

• To calculate the increase in a number,

You can add the combined percent
amount to the original number.
12% of 100 = 0.12 × 100 = 12
100 + 12 = 112


You can multiply the original number
by a single percent greater than 100.
112% of 100 = 1.12 × 100
= 112


• Percents of percents can be used to determine amounts that result from
consecutive percent increases or decreases.

Show you know

What is the final sale price at each store? Which is a better buy?
Explain your thinking.
Store A: 50% off one day only
Store B: 25% off one day followed by 25% off the reduced price the
second day

200 is the price and to get 50 % you divide 200 by 2 which is 100 so the sale price is 100 dollars.

The price is 200 and to find 25% you divide 200 by 4 and the other side by 4 . Which is 50. 50=25 %. so 200-50 =150 and the percent is 75 percent. you subtract 50 from 200 because 50 is 25% and the discount is 25%.

So then the next day its on sale again but 25% off yesterdays price . So 150 is the new 100% then to find 25% 150 divided by 4 = 37.50 and remember whatever you do on one side you do to the other side. So 25% is 37.50 so then you take 150 -37.50 and it equals 112.50

Store A is the better buy because the sale price is 100 and the sale price at store b is 112.50.

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Michael's Percent Scribepost for Feb. 1 2010

1st question:

1st way:35x1.11=38.85 I multiplied it by 1.11 because 35 divided by 1 is 100% and 0.11 would be 11%.

2nd way:


After you find the pst amount and the gst amount you just add the taxes to the price answer= 38.85


=================================

2nd question:


1st way:
35/5=7 (20%) so it is a 7$ discount 35-7=28 (new 100%)
28x1.11= 31.08

2nd way:

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Percent Scribe for January 26, 2010

5. a) 2/5% of 325 = 1.3
2/5% = 0.4%
First find 1% of 325. Do that by dividing 325 to 100 and you will get 3.25, then divide it again by 10 to get 0.1% (0.325) multiply 0.325 by 4. The answer is 1.3

b) 15 1/4% of 950 = 144.88
Find 10% of 950, 950÷ 10 = 95 (10%), divided it into half so 95 ÷ 2 = 47.5 (5%), 95 + 47.5 = 142.5.
950 ÷ 100 = 9.5 (1%) ÷ 4 = 2.375 (1/4%)
142.5 + 2.375 = 144.88

c) 175% of $125.50 = 219.63
100% is 125.50 ÷ 2 to get 50%.
125.50 ÷ 2 = 62.75 (50%) divide it into 2to get 25%
62.75 ÷ 2 = 31.375(25%)
125.50 + 62.75 + 31.375 = 219.63

6. a) 5/8 of 520 = 3.25
5/8 = (0.625)
520 ÷ 100 = 5.2 (1%) ÷ 2 = 2.6 (0.5%) ÷ 2 = 1.3 (0.25%) ÷ 2 = 0.65(0.125)
2.6 + 0.65 = 3.25

b) 75 2/5% of 200 = 150.8
divide 200 by 4 to get 25%! 200 ÷ 4 = 50(multiply 50 by 3) 50 x 3 = 150 (75%)
divide 200 by 100 to get 1%! 200 ÷ 100 = 2(1%) (divide by 10) 2 ÷10 = 0.2 (0.1) multiply by 4 to get 2/5%. 0.2 x 4 = 0.8
150 + 0.8 = 150.8

c) 250% of $76.50 = 191.25
Multiply 76.5 by 2. 76.5 x 2 = 153(200%)
divide 76.5 by 2. 76.5 ÷2 = 38.25

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Vicky's Finding Percent Post

HEEEYYOO.

Today in class we were practicing how to find percent out of different numbers. Our homework was to find a variety of percents out of 400.

I did this all without a calculator. I did this all in my head. So thats why I dont have any of the work to show. Because some of the answers were kind of hard to write out and explain how I've done it.

I don't know if my answers are all that accurate, but I've double checked them on my calculator to see if they were correct. If you guys find any errors you can just comment .


Sorry if it's blurry and bright on one side and dark on the other. I had to use my webcam because my camera didn't work.

Hope you guys liked my post :) COMMENT PLEEEEASE .

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Problems & Percents

Problems & Percents

We will use example 4: Determine a Percent

This example uses PROPORTIONS in this problem.

To solve this problem we will do part a.

a)What percent is the current speed of the original speed?

For this we will use proportions to help us.

We need to find the CURRENT speed over the ORIGINAL speed.

Now we need to find the original speed and current speed.

The current speed is at 50 km/year.

The original speed was at 10 km/year.

Now you can see here the current speed is 50 km over 10 km (Current Speed over Original Speed)

Now we need to find what percent of the current speed is over the original speed.

10 km is 100%

How do you get from 10 km to 50 km?

10 x 5 = 50 km

So we do the same thing we do to the percent.

100% x 5 = 500%

Here is the answer to a.

The current speed is 500% over the

original speed.

Now we will do b.

In this question we're finding how much the pole drifts in 1 year around the earths circumference in percent form.

We know that the pole drifts 50 km / year.

The Earths circumference is 40 000 km.

We will also be using proportion for this.

We need to find the poles km over the earths circumference.

So it will be 50 km over 40 000 km.

Now we will need to simplify this into lowest terms.

The answer we get is 1 / 800

Now we can find the percent by dividing 1 by 800.

1/800 = 0.00125

To get the percent we need to multiply the decimal by 100.

0.00125 x 100 = 0.125%.

So the answer is that at 50km / year the pole drifts 0.125% or 1/8% of the Earths circumference in 1 year.

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Percents 2

As of January 17th, 10 we continue with our new unit "PERCENTS,FRACTIONS, AND DECIMALS". So for todays class we had to work on our foldable under (fractions, decimals, and percents). If you hadn't finished it yet .. that's what my scribe is here for to help you :) .

KEY IDEAS :

• Fractions, Decimals, and Percents can be used to represent numbers in various situations.
• Percents can be written as a fraction and as decimals.

1/2% = 0.5 150% = 150/100 42 3/4% = 42.75%

o.5% = 0.5/100 = 1.5 or 1 1/2 42.75 % = 42.75/100

= 0.005 = 0.4275

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Krystal`s Scribe for January. 14, 2010

Decimal to Percent=You just have to move the decimal 2 places to the right.Another way to do it is to multiply it by 100. For example. 1.25X100 =125. Just add the percent sign. I find it way easier by doing it with multiplying by 100.

Fraction to Percent= The way I learned was a little different.Since fractions is the same as division, I just divide the fraction number and get the percentage. For example . 61 over 100= 61 divided by 100 = 0.61,just add the percent sign.

Decimal to Fraction= When a decimal has 2 numbers after the decimal it`s out of 100, if it only has 1 number after the decimal, its out of 10, if it has 3 numbers after the decimal it`s out of 1000.ect.For example. 0.005= 5 over 1000. But if its a decimal like this "3.2", 3 is the whole and 2 is out of 10 since it`s the only number after the decimal.the fraction would be , 3 as the whole and 2 over 10.Don`t forget to simplify so it would be , 3 as a whole and 1 over 5. To simplify it , just divide it by 2.

Fraction to Decimal= Remember, a fraction is division turned up-right. That means if the fraction was, 7 over 10, side-to-side would be, 7 divided by 10 =0.7 . Easy,right ? But what if your fraction has a whole number ? for example : 1 and 1 over 4, since the 1 over 4 is simplified, think of it as not simplified "25 over 100" = 25 divided by 100 = 0.25. Take the ".25" and do nothing to the whole number,Then you have "1.25". Sorry, I tried explaining it as best as I could. It`s really easy if you understand what I`m talking about.

BY THE WAY ! Sorry it`s late...

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Hannah's scribepost for January 13.

Sorry it's late.

question 4.

question8.

How many hundred grids are needed to show each of the following percents?

a.) 300% = 3 hundreds grids

b.) 466% = 5 hundreds grids

c.) 1200% = 12 hundreds grids

question9.

Give two examples where a percent greater than 100% might be found in everyday life.

- Nutritional facts.

- Receipts (taxes)

question 16.

Suppose one large square represents 100%. The square is divided into smaller equal-sized pieces.

a.) If there are 1000 pieces, what percent do 17 pieces represent?

b.) If there are two large squares each divided into ten smaller pieces, what percent do 13 pieces represent ?

c.) If the large square is divided into eight smaller pieces, show how to represent 87 1/2 and 56 1/4.

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