Time for Scribes

Mr. Kuropatwa introduced me to the world of Scribe Posts. It is an essential part of the Grade 8 Math Classroom. You will be expected to write one scribe post every 30 classes or about 4 a year. That doesn't sound like to much does it.

A Scribe post is

The assignment is simply to post a brief summary of what happened in class each day. A different student is responsible for the daily scribe post and they end their post by choosing the next scribe. The first scribe is a volunteer. The teacher's daily involvement is limited to updating a post called The Scribe List which is at the top of the links list in the sidebar of the class's blog.

To complete a scribe post the student must

Write a brief summary of what we learned in class today. Include enough detail so that someone who was away sick, or missed class for any other reason, can catch up on what they missed. Over the course of the semester, the scribe posts will grow into the textbook for the course; written by students for students. Remember that as each of you write your scribe posts. Ask yourself: "Is this good enough for our textbook? Would a graphic or other example(s) help illustrate what we learned?" And remember, you have a global audience, impress them.

Here are examples of good scribe posts Pythagoras Scribe One Day In Math Algebra Masterpiece

Here are some scribe posts that have made The Scribe Post Hall of Fame.

When you are done your scribe post choose another student to be the scribe and label your post scribepost.

Measures of Central Tendency Pretest 1

Question 2. Bill's history marks are: 72, 66, 65, 73, 71, 69, 68, 72.
Find the mean, mode, median and range.

First put all the numbers in numerical order. That would make it easier.

65, 66, 68, 69, 71, 72, 72, 73

Mean= 69.6

Add up all the numbers, you get 556, the sum of all data. Then divide 556 by 8, the number of pieces of data, getting 69.6

Median= 70

The two middle numbers are 69 and 71. Add them together then divide them by two. 140 / 2 = 70

Mode = 72

72 is the most common number.

Range= 8

Subtract 65 from 73. 73 - 65 = 8


A) If he scores 91 on the next test, which measure of central tendency will be most affected? Explain.

65, 66, 68, 69, 71, 72, 72, 73, 91

Mean= 71. 8

Add up all the numbers getting 647. Then divide it by 9, equaling 71.8.

Median= 71

71 is the median because there is an odd number of data pieces in this set, making it easy to identify the median.

Mode= 72

There are two 72's while there are only one of every other number.

Range= 26

Subtract 65 from 91. 91 - 65 = 26


B) If he scores 66 on the next test, Which measure of central tendency will be most affected? Explain.

65, 66, 66, 68, 69, 71, 72, 72, 73


Mean= 69.1

Add all the numbers together to get 622. Divide by 9, equaling 69.1.

Median=69

69 is the median because there is an odd number of data pieces in this set, making it easy to identify the median.

Mode= 66, 72

Since there are two 66's and 72's, this time the modes would be both 66, and 72.

Range= 8

Subtract 65 from 73. 73 - 65 = 8

Pretest 2: Question 2

2. The mean mark on 4 tests is 78%. What mark is needed on the next test to increase the mean to 80%?

average of 4 test is 78%

4 x 78 = 312 or 78 + 78 + 78 + 78 = 312 = sum of all data

average of 5 test is 80%

5 x 80 = 400 or 78 + 78 + 78 + 78 + ? = 400 =sum of all data

the difference between the both is

400 - 312 = 88

meaning 78 + 78 + 78 + 78 + 88 = 400

^_^

Question 1

1.Find a set of values to fit these conditions
A) Five numbers with a mean of 7 and a median of 5.
B) Seven Numbers with a mode of 8 and a median of 6.
C) Seven numbers with a mode of 10 and a mean of 9

Answers:
A.1,3,5,10,16= 35/5=7
B.1,2,3,6,8,8,8
C.10,10,2,10,9,19,3=63/7=9

Measures of Central Tendency Pretest 2

Here is the worksheet I provided you on Friday. Please answer the questions in a comment. You can also ask questions about anything you need help on here.

Good Luck

1. State 7 prices, where the median is $3.00, the highest price is $20.00 and the lowest price is $1.00.

2. The mean mark on 4 tests is 78%. What mark is needed on the next test to increase the mean to 80%?

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.

4. Mr. Thompson gave a test to six students who were absent. The highest score was 93 and the lowest score was 65. The mean of the test scores was 79. Create a list of six test scores that satisfy these conditions. Explain why your test scores satisfy these conditions.

5. Find the measures of central tendency for the following data sets:


A) 33, 18, 40, 26, 29, 20, 30
B) 20, 50, 20, 50, 17, 15, 25, 50, 25, 15
C) 15, 20, 80, 75, 5, 50
D) 16, 40, 44, 16, 40, 40, 80, 17, 64, 64, 100

Measures of Central Tendency Pretest 1

Measures of Central Tendency Pretest

Here is the worksheet I provided you on Thursday. Please answer the questions in a comment. You can also ask questions about anything you need help on here.

Good Luck

1.Find a set of values to fit these conditions.

A) Five numbers with a mean of 7 and a median of 5.
B) Seven Numbers with a mode of 8 and a median of 6.
C) Seven numbers with a mode of 10 and a mean of 9.

2. Bill's history marks are: 72, 66, 65, 73, 71, 69, 68, 72.
Find the mean, mode, median and range.

A) If he scores 91 on the next test, which measure of central tendency will be most affected? Explain.

B) If he scores 66 on the next test, Which measure of central tendency will be most affected? Explain.

3. Find the Value of x in the data.

10, 12, 6, 6, 14, x, 8, 10, 12, 12, 8, 14

A) If the mean is 10.
B) If the mode is 12.
C) If the median is 11.

Is there more than one possible answer for each question?

How to sign up

Here are the instructions for you to get your blogger account active.

A) Get a google account. You can do this from either blogger or google itself.

Your google account will be your email and a password you create.

B. You will use this account to access betablogger.

At Blogger you need to create a blog. Call it any thing and follow the steps.

Create 1 post and publish it.

***** Keep this window open for the next steps*****

Open a new browser window (control n)


Find the email I sent inviting you to the blog.

Do not click on this link but paste it into your address bar and hit enter.

Reenter your google password on the page provided.

YOu should see your class blog on your dashboard.

Delete your fake blog.

You are in business.