Math Pretest Equivalents

Math Pretest

Convert the following values so that you can place them on the number line below. Show all your work.

0.175

55%

3:10

15/51

9:3

How could you determine whether the average of these numbers is greater than 10 or less than 10 without actually computing the average. Explain how you decided the average was more than or less than 10.

Page E-49 Q and A

. Find each probabililty if you choose one card at random.

7) P (striped) = 3/8
PO = 3

TPO = 8

8) P (white) = 4/8

PO = 4

TPO = 8

9) P (shaded) = 1/8
PO = 1

TPO = 8

10)P (white or shaded) = 5/8

PO = 5

TPO = 8

11) P (striped or white) = 7/8

PO = 7

TPO = 8

12) P (striped or shaded) = 4/8

PO = 4

TPO = 8

13) P (not striped) = 5/8

PO = 5

TPO = 8

14) P (not white) = 4/8

PO = 4

TPO = 8

15) P ( striped or white or shaded) =

8/8 = 1 whole

My own answers.

1) P (not shaded) = 7/8

PO = 7

TPO = 8

2) P (green) = 0

There is no green in the cards.

Rina

Jorel's E-50:#4

n) If you flip a coin 150 times, about how many times would you expect to get heads?

ans: 75 150/2=75
2 is the T.P.O. so getting a heads should have 50%chance.

c) The letters a, e, i, o, u, and y are vowels. If one letter of the alphabet is chosen randomly, what is the probability it is a vowel?

ans: 6/26 or 3/13

k) If you randomlyu pick a date in April, how many equally likely outcomes are there?

ans: 30
There are 30 days in April so the total possible outcome is 30.

p) A magician asked you to pick a card, any card, from a standard deck of 52 cards. What is the probability of picking an ace?

ans: 4/52 or 1/17
There are 4 Ace in the standard deck so the P.O. is 4/52 or 1/13 .

paola's E-49 probability part I

I. find each probability if you spin the spinner once.

1.P(red)

answer:The probability of getting red in the spinner is 1/5.if you want to get the percentage of the probability,first you divide 1/5 then multiply the answer to 100 which the answer is 20%.

2.P(green)

answer:The probability of getting green in the spinner is 1/5 which the answer is the same as number 1.So the percentage is also 20%

3.P(blue or white)

answer:The probability of getting blue or white in the spinner is 2/5 or40%.

4.P(not yellow)

answer:The probability in getting all the colors except for the color yellow is 4/5 or 80%

5.P(not red)

answer:This is also the same as number 4 but now they are looking for the probability of all the colors except for the color red.So the answer in this question is also 4/5 or 80%

6.P(blue or white)

answer:The probability of getting blue or white is 2/5 or 40%

make your own question part

II.find each probability if you spin once.

1.P(blue,red or purple)

answer:3/8 or 37.5%

2.P(black)

answer:1/8 or 12.5%

3.P(brown,baby blue,black or green)

answer:4/8=1/2 or 50%

4.P(not baby blue)

answer:7/8 or 87.5%

5.P(black or red)

answer:2/8 or 25%

Ian's E-49 Question#1

Find each probability if you spin the spinner once.

1.P(red)= 1-possible outcomes

5- total possible outcomes=20%

I divided the possible outcomes and total of possible outcomes then I multiply it to 100 to become a percent of my answer.

1/5=0.2=20%

2.P(green)1/5 =20%

I did it as the first one I divided the possible outcomes and the total possible outcomes then I multiply it to 100 to get the percent which is 20%

1/5=0.2=20%

3.P(blue or yellow)2/5=40%

This is the same as the other ones I divided the possible outcomes which is 2 to the total possible outcomes which is 5 then I multiply it to 100 to become a percent which is 40%.

2/5=0.4=40%

4.P(not yellow)4/5=80%

First I take the possible outcomes which is 4 and the total possible outcomes which is 5 then I divided it.Then I multiply it to 100 to become a percent which is 80%.

4/5=0.8=80%

5.P(not red)4/5=80%

what I did is like this first I look for the othr thats not red. Then I found the possible outcomes which is 4 and the total possible outcomes which is 5.Then I multiply it to 100 to become a percent.

4/5=0.8=80%

6.P(blue or red or yellow)3/5=60%

I count the blue red yellow which is the possible outcomes that is 3 and I look for the total possible outcomes which is 5.I multiply them to know the ratio then I divided it to 100 to become a percent.

3/5=0.6=60%

My own questions:

1(blue or brown)

2P(red or yellow)

3P(blue or yellow)

4P(red)

answer:

1. 2/5=0.4=40%

2. 2/5=0.4=40%

3. 2/5=0.4=40%

4. 1/5=0.2=20%

Camille's Probability E-49 Part II

II. Find each probability if you choose one card at random.

7. P (striped) 3/8, there are 3 striped cards out of 8 cards.

8. P (white) 4/8 or ½, there are 4 white cards out of 8 cards. I reduce them into half,
that’s why I have ½.

9. P (shaded) 1/8, there’s one shaded card out of 8 cards.

10. P (white or shaded) 5/8, there are 4 white cards and 1 shaded card. I added 4 into 1, 4+1=5, it‘s 5 cards out of 8 cards. So the answer is 5/8.

11. P (striped or white) 7/8, there are 3 striped cards and 4 white cards. I added them together, 3+4=7, 7 cards out of 8 cards.

12. P (striped or shaded) 4/8 or ½, there are 3 striped cards and 1 shaded card. I
added them together, 3+1=4, 4 cards out of 8 cards. Then, I reduce them into
half, the answer is ½.

13. P (not striped) 5/8, there are 4 white cards and 1 shaded card. I added them
together, 4+1=5, 5 cards out of 8 cards.

14. P (not white) 4/8 or ½, there are 3 striped cards and 1 shaded card. I added them
together, 3+1=4, 4 cards out of 8 cards. Then, I reduce them into half, the
answer is ½.

15. P (striped, white or shaded) 8/8 or 1, there are 3 striped cards, 4 white cards and
1 shaded card. I added them all together, 3+4+1=8, 8 cards out of 8 cards. 8/8 is
whole number, so you can call it 1.

II. Find each probability if you choose one card at random.

7. P (orange) 2/8 or ¼, there are 2 orange cards out of 8 cards. I reduce them into half, that’s why I have ¼.

8. P (pink or blue or orange) 8/8 or 1, there are 4 pink cards, 2 blue cards and
2 orange cards. I added them all together, 4+2+2=8, 8 cards out of 8 cards. 8/8 is
whole number, so you can also call it 1.

9. P (blue) 2/8 or ¼, there are 2 blue cards out of 8 cards. I reduce them into half, that’s why I have ¼.

10. P (not blue) 6/8 or ¾, there are 4 pink cards and 2 orange card. I added them
together, 4+2=6, 6 cards out of 8 cards. I reduce them into half, the
answer is ¾.

11. P (orange or blue) 4/8 or ½, there are 2 orange cards and 2 blue cards. I added
them together, 2+2=4, 4 cards out of 8 cards. Then, I reduce them into half, the
answer is ½.

12. P (blue or pink) 6/8 or ¾, there are 4 pink cards and 2 orange card. I added
them together, 4+2=6, 6 cards out of 8 cards. I reduce them into half, the
answer is ¾.

13. P (not pink) 4/8 or ½, there are 2 blue cards and 2 orange cards. I added them
together, 2+2=4, 4 cards out of 8 cards. Then, I reduce them into half, the
answer is ½.

14. P (pink) 4/8 or ½, there are 4 pink cards. I added them together, 2+2=4, 4 cards
out of 8 cards. Then, I reduce them into half, the
answer is ½.

15. P (pink or orange) 6/8 or ¾, there are 4 pink cards and 2 orange card. I added
them together, 4+2=6, 6 cards out of 8 cards. I reduce them into half, the
answer is ¾.

rivka's e-49 III questions:

16) what is the probability of guessing the correct answer to a multiple choice question if there are 5 choices?

p=1/5 because there is only one possible correct answer and 5 is the total of the choices (TPO)!

percent: 1 /5=0.2 0.2x100=20% or 20 out of 100


17)what probability of guessing the correct answer to a true-false question?

p=1/2 because there is only one possible correct answer, either true or false and the 2 is the total of the choices (TPO)!

percent: 1/2=0.5 0.5x100=50% or 50 out of 100


18)what is the probability that your birthday will fall on saturday or sunday?

p=2/7 beacause there are 2 possible days that your birthday will fall on that day and 7 is the total days in a week (TPO)!

percent: 2/7=0.285 0.285x100=28.5% or 28.5 out of 100

my own question:

18) what is the probability that your graduation will fall on monday?

p=1/7 because monday is the only day in a week and it's the only possible day that your graduation will fall and 7 is the total days in a week (TPO)!

percent: 1/7=0.142 0.142x100=14.2% or 14.2 out of 100

im done!!! is this right mr. harbeck!?

Maxine's E-49 Number III Questions

Question 16 -

What is the probability of guessing the correct answer to a multiple choice question if there are 5 choices?

The probability is 20%.
You take the number of outcomes, which is 1 and divide it by the total possible outcomes, which is 5.

1/5 = 0.2 * 100 = 20%

Question 17 -

What is the probability of guessing the correct answer to a true-false question?

With a true-false question there are only 2 answers so that's your total possible outcome and you can only choose 1 so your number of outcomes. So divide them.

1/2 = 0.5 * 100 = 50%

Question 18 -

What is the probability that your birthday will fall on a Saturday or Sunday?

Well there are 7 days in a week so that's your total possible outcome and Saturday and Sunday are only 2 so that's your number of outcomes. So divide them.

2/7 = 0.2857 * 100 = 28.57%

I hope that this makes sense!

Making a Question of my Own -

What is the probability that your birthday will fall on a Wednesday?

So Wednesday is only 1 of the days in the week so that's your number of outcomes and there are 7 days in a week in total so that's your total possible outcomes. So divide them.

1/7 = 0.1428 * 100 = 14.28%. 14.28% is your probability.

E-49 question 1 .

E-49 1: Find each probability if you spin the spinner once.

PART ONE .

1: P(red)
answer : 1/5 ( one out of five )
2: P(green)
answer : 1/5 ( one out of five )
3: P(blue or white)
answer : 2/5 ( two out of five )
4: P(not yellow)
answer : 4/5 ( four out of five )
5: P(not red)
answer : 4/5 ( four out of five )
6: P(blue or red or yellow)
answer : 3/5 ( three out of five )

PART TWO .

this is what we use when writing probability fractions.
(find each probability if you spin the spinner ONCE.)

{ 1: P(red) } P= 1(P.O.) over 5(T.P.O.)
The probability that it will land on red is 1/5 because red is ONE of the FIVE colours there. The other colours are yellow, blue, white, and green.

{ 2: P(green) } P= 1(P.O.) over 5(T.P.O.)
The probability that it will land on green is 1/5 also because green is one of the five colours.

{ 3: P(blue or white) } P= 2(P.O.) over 5(T.P.O.)
The probability that it will land on blue or white is 2/5 because blue & white are two of the 5 colours.

{ 4: P(not yellow) } P= 4(P.O.) over 5(T.P.O.)
The probability that it will land on any colour but yellow is 4/5 because there are 4 other different colours than yellow.

{ 5: P(not red) } P= 4(P.O.) over 5(T.P.O.)
The probability that it will land on any colour but red is 4/5 because there's 4 other colours than red.

{ 6: P(blue or red or yellow) } P= 3(P.O.) over 5(T.P.O.)
The probability that it will land on either blue, red, or yellow is 3/5 because there are 2 other colours than that.

PART 3 .

Find each probability if you spin the spinner once.

1: purple

2: orange

answer:

1: 1/3

2: 1/3

` Marielle D. 8-17 }

Boeun's Probability Post E-49 7~15

FIND EACH PROBABILITY IF YOU CHOOSE ONE CARD AT RANDOM

NUMBER OF POSSIBLE OUTCOMES
------------------------------------------------------------ = PROBABILITY
TOTAL NUMBER OF POSSIBLE OUTCOMES




Find each probability if you spin the spinner once.


7. P( striped) = 3/8 (because there's 3 striped squares)

8. P(white) = 1/2 (because there's 4 whites in 8 so it

should be 4/8 but i reduced it in to half because

it's same thing)

9. P(shaped) = 1/8 (because there's only 1 square out of those 8

squares)

10. P(white or shaded) = 5/8 (because there's 4 white and 1 shaded so it's 5)

11. P(striped or white) = 7/8 (because there's 4 white and 3 striped so it's 7)

12. P(striped or shaded) = 1/2 (because there's 3 striped and 1 shaded

squares and it's add up to 4 so it should be 4/8 but i reduced it to half)

13. P(not striped) = 5/8 (because there's 3 striped squares out of 8 squares

so 8-3 = 5 it is 5/8)

14. P(not white) = 1/2 (because there's 4 white squares out of 8 so

8-4=4 it is 4/8 but i reduced it to half)

15. P(striped or white or shaded) = 8/8 (because there's 3 striped,

4 white and 1 shaded, so it adds up to 8 and there's total 8 squares.

It is 8/8 but you can say 1 as a whole thing)


NEW QUESTION

If you pick squares at random, what is the probability?

P(pink, white,blue) = 3/8 because there is only one of these colours

P(yellow, black, red) = 2/8 because there is no red

P(green, orange) = 1/8 because there is no orange

P(brown) = 0/8 because there is no brown

P(brown, orange, green, yellow, black , red, blue) = 4/8 because there's no brown, orange, red

Jaymie's E-50 number 2 Questions

2. A spinner is shown at the right for which each outcome is not equally likely.

Part 1

E. If you spin the spinner once, what is the probability that it will stop on A?

Answer: P(a)=2/4 or 1/2

A. If you spin the spinner once, what is the probability that it will stop on B?

Answer:P(b)= 1/4

T. If you spin the spinner 50 times, about how many times would you expect it to stop on A?

Answer: P(a)=25 times

Y. If you spin the spinner 80 times, about how many times would you expect it to stop on C?

Answer: P(c)=20 times

Part 2

this is the format of writing probability fractions.

E. If you spin the spinner once, what is the probability that it will stop on A?
Answer: P(a)=2/4 or 1/2

The probability that it will land on A is 2/4 (2 out of 4) or 1/2 (1 out of 2) or 50% because A is Half of the circle or is 2 /4 of the circle because you have to find the common pieces, which is 4ths. The 2 is the possible outcomes and 4 is the total possible outcomes, using the common piece.

A. If you spin the spinner once, what is the probability that it will stop on B?
Answer: P(b)=1/4

The probability that it will stop on B is 1/4 because since the common piece is 4ths, B would be 1/4 of the circle or 25%. The 1 is the total possible outcomes because there is only one B that the spinner can land on and the 4 is the total possible outcomes because there are 4 possible outcomes using the common piece which is 4ths.

T. If you spin the spinner 50 times, about how many times would you expect it to stop on A?
Answer: 25 times

The answer is 25 times because : (p.o.)1/2(2 multiplied by 25 equals 50 ) = 25/50(50 divided by 2 equals 25)
25 would be the number of times you would spin A out of 50 spins.

Y. If you spin the spinner 80 times, about how many times would you expect it to stop on C?
Answer: 20 times

The answer is 20 times because : (p.o.)1/4(4 multiplied by 20 equals 80 ) = 20/80(80 divided by 4 equals 20)

20 would be the number of times you would spin C out of 80 spins.

Part 3

2. A spinner is shown at the right for which each outcome is not equally likely.

1. what is the probability of spinning green and pink? express in fraction and percentage.
2. what is the probability of spinning purple and pink?what do you notice? express in fraction and percentage

1. what is the probability of spinning green and pink? express in fraction and percentage.
answer: The probability of spinning green and pink is 3/4 or 75%.


2. what is the probability of spinning purple and pink?what do you notice? express in fraction and percentage
answer: The probability of spinning purple and pink is 2/4 (1/2) or 50%. I notice that if I Spin purple or pink that it will be a 50 % chance. Now it would be equally likely because now it is a 50, 50 chance.

-Jaymie S. rm 8-17-

Amy's Probability Post (E-50; Questions N-P)

N) If you flip a coin 150 times, about how many times would you expect to get heads?

The answer will be 75, 1/2 or 50% because there are 2 sides on a coin. If you divide 150 by 2, the answer will be 75. 75 is a way of showing that it is the half of 150. You can get a 50/50 chance of getting heads when you flip the coin. Half of the chance will land on heads and the other half of the chance will land on tails. 1/2 is a way of writing one half of the chance of flipping a heads. Another way of showing it is 50%. 50% is half of the chance out of 100% when you can flip the coin and half the chance will be heads.

K) If you randomly pick a date in April, how many equally likely outcomes are there?

There would be 30 outcomes because there are 30 days in April. If you randomly pick a date in April, there would be 30 days for you to pick. So there are 30 days or 30 total possible outcomes if you randomly pick a date in April.

C) The letters a, e, i, o, u, and y are vowels. If one letter of the alphabet is chosen at random, what is the probability it is a vowel?

The probability of it is a vowel is 6/26=3/13 or 23% because there are 26 total possible outcomes and 6 possible outcomes. 6 is how many letters that are vowels in the alphabet and 26 is the total of letters in the alphabet. 23% is the percent of how many letters that are vowels out of 100%.

P) A magician asks you to pick a card, any card, from a standard deck of 52 cards. What is the probability of picking an ace?

The answer will be 4/52=1/13 or 7.6%. 4 is the possible outcomes which is the number of how many aces are in the deck of cards, 52 is the total possible outcomes and it is the total number of how many cards are specifically in the deck of cards. When you reduce 4/52, you get 1/13. It can be written in both ways. Another way that it can be written is that when you divide 4 by 52 and multiply it by 100, you will get the answer of 7.6%. 7.6% means that you will get 7.6% of a chance of picking an ace in the deck of cards.

My question: A magician asks you to pick a card, any card, from a standard deck of 52 cards. What is the probability of picking a 2 and queen?

The answer will be 8/52=4/26=2/13 or 15.3%. This time 8 is the possible outcome and 52 is still the total possible outcome. The 4 changed into the 8 because according to the deck of 52 cards, there are 4 cards for each number. So this means queen and the 2 have 4 cards for that number. You will have a chance of 4/26 to pick a queen or 2 out of the deck of cards. When you reduce 8/52, you will get 4/26. 15.3% means that you will get 15.3% of a chance of picking a 2 or a queen.

Math

Math Pre-Test #2

3. Julie buys a book, a game, a puzzle, and a piece of computer software at the book fair. The computer software cost $10. Julie claims that the average price of the items she bought is $2.50. Can she be correct? Why or Why not.


The items Julie bought cannot have an average of $2.50 because one of her items costs $10, and all her items would have to be $0 for this to be possible.
If Julie's items were to have an average of $2.50, the computer software's price would have to decrease.

FOR EXAMPLE :

The book costs $2.50*
The game costs $1.50*
The puzzle costs $1.00*
The computer software costs $5.00*
Data: $2.50 + $1.50 + $1.00 + $5.00 = $10.00/4 = $2.50 <-- MEAN/AVERAGE

The sum of all data ^^ divided by the amount of data, (4), equals $2.50, (average price).


-CJ P. 8-17

This Is My Life

A Graph of My Life

Estimate the amount of time you spend each weekday doing the following activities:

Playing
Attending school
Doing homework
Sleeping
Watching television
Other activities

Make a graph that represents your estimates. Please remember that there are 24 hours in a day!

This Assignment is due Thursday September 14.
Please leave comments on this post if you have any questions.

Mr. Harbeck