Choose the Best Measure of Central Tendency

Here is a chart show how many shirts a man sold in 10 weeks.

Now what I want you to do is find the Mean, Median, Mode, and Range

The first thing I'll do is rearrange the set of data.

7,7,7,8,9,9,10,11,12,50. Mean 13 Median 9 Mode 7 Range 43

The best measure of central tendency, in this case, is the median (9) since many numbers in the set of data are close to it.

How many shirts should the man buy for the next 30 weeks?

Since nine is the best representative, I will multiply 9 by 30.

9x30=270

The man should buy 270 shirts.

Here are some things I found to help you understand measures of central tendency more:

This one I actually made,

Here is a video.

and lastly, I found this website that might also come in handy,

http://www.onlinemathlearning.com/measures-central-tendency.html

Homework Pg. 449-451 #3-16

Well thank you for reading my blog, hope you enjoyed!

Solving One Step Algebra Equations

Apply the opposite equation

a+5=7 Step one, isolate the variable

-5 -5 Step two, apply the opposite integer

a=2

a+5=7 The third and final step is to check your answer.

2+5=7

7=7

Easy isn't it? Now that you've learned how to do this, try these questions:

1)b+3=5

2) c/3=7

3)4d=16

Stuck? Well, here are the answers!

HOMEWORK: Pg. 405-407 (questions 1-21)

(text book available here)

If I didn't help, please refer to these videos:

One Step Algebra Equations - Division

One Step Algebra Equations - Multiplication

One Step Algebra Equations - Addition

One Step Algebra Equations - Subtraction

or check this game out:

http://www.mathsnet.net/algebra/l1_equation.html

Thank you for reading my scribe! Please remember to comment below.

Subtracting Mixed Numbers

If you have like denominators, like

2 3/4 - 1 1/4,

then use fraction strips.

eg.

1 2/4 in lowest terms is 1 1/2

Second Method

Subtract the whole numbers,

2 3/4-1 1/4 2-1=1

then subtract the fractions

3/4-1/4=2/4

1 2/4 in lowest terms is 1 1/2

a) 2 2/3-1 1/3=1 1/3 b)3 7/8-1 3/8=2 4/8= 2 1/2 c)4 3/4-1/4= 4 2/4= 4 1/2

Subtracting Mixed Numbers With UNLIKE Denominators
3 3/8- 1 1/2 3=24/8 1=8/8

27/8-12/8=15/8=1 7/8

Another Way to Regroup

3 3/8-1 1/4

2 11/8-1 4/8 (borrowed 8/8 or 1 from 3)

=1 7/8

a)4 1/4-3 2/5 b)4 1/4-7/8

4 5/20-3 8/20 4 2/8-7/8

3 25/20-3 8/20 3 10/8-7/8

=17/20 =3 3/8

This concludes my blog about subtracting mixed numbers but remember...

Pi day is on Tuesday March 16 at lunch time.

Clues will be all over the school and the first person to find all of them and get to the final destination will win a prize.

Good luck, and Good Bye!

January 26, 2010

Random - an event in which every outcome has an equal chance of occuring.

For example : flipping a coin

spinning a spinner with four equal size options

rolling a die

selecting a card

Not everything in the world is random so there must be something that is not random. Like spinning a spinner with four unequal size options.

In 12 spins, it should land on blue 6 times, red 3 times and blue 3 times.

Goldilocks sits on 3 chairs and eats porridge. How many possible outcomes.

9 possible outcomes. 1/9 1:9 11%

Does Goldilocks choose the chair and porridge a random? Explain.

No because she has choice and preference.

P(just right chair and just right porridge) 9/9 9:9 100% because she has a choice

A marble is randomly selected from a bag that contains a red, blue, and 1 green marble. Then a 4 sided die is rolled.

A)Create a table to show the sample space

B) What is the probability of choosing any colour and rolling any number but 3?

9/12 3/4 75% 3:4

C) What is P (blue or green, a number greater than 1) 6/12 1/2 1:2 50%

D)P(black, 1) 0/12 0% 0:12 <------ impossible event.

E) P (red, blue, or green, and die displays 4) 3/12 1/4 1:4 25%

H.W.

A 4 sided die labled 1,2,3,4 a spinner divided into 5 equal parts: fly, swim, hop, glide, and walk.

a) create a table to show the sample space.

b)what is P(3,swim)

c) what is P(odd #, hop)

Hope you enjoyed reading my scribe! If I didn't help you at all, go to Mr. Isfeld at math help.