## Wednesday, October 13, 2010

### Today's Homework

Just try not to bother me!

## Monday, June 21, 2010

Exam Review Study Guide

Define

perpendicular- Describes line that intersect at right angle
Parallel- Line that never meet
Intersection- Line that Cross at any angle
perpendicular bisector-A line that divides a line segment in a half
Angle bisector- of a triangle is a line segment that bisects one of the vertex angle of a triangle.
acute angle- An acute angle is one which is less than 90°
Obtuse angle- An angle whose measure is greater than 90° and less than 180°

Label
Parallel

Intersection

Angle bisector Perpendicular bisector

## Friday, June 18, 2010

### Area

The number of square units cantained in a two demensional shape

eg.

this square has an area of 4 square units

-Area is the surface space a shape takes up.

Area of square or rectangle length X width=

L*W=area

eg.
area=6x3
=18 cm2
Parallelgram-a four sided figure with opposille sides parallel and equal
eg.

### Measures of Central Tendancy

Mean- a measure of central tendancy

You can find the mean by the sum (adding) of a set of values divided by the number of values in the set.
eg. 4,5,8,9,9

=4+5+8+9+9 / 5
=35 / 5
=7 <- that is the mean or average

mean-7
median-7
mode-7

b)300,250,400,300,250
-250,250,300,300,400

mean-300
median-300
mode-250 and 300

PG. 431-432 # 2-16

### Measure of Central Tendency

- is a value that represents the centre of a set of data
- can be mean, median, mode

Median - the middle number in a set of data after the data has been arranged or ordered

eg. 2, 5, 6, 8, 9 median is 6

eg. 1, 3, 6, 8, 9, 10 median is 7

*add the two middle values together then divide by two : 6 + 8 = 14 14 divided by 2 = 7

*to find the median of data sets with an even number of values (eg. 2, 3, 4, 5, 6, 7) you have to use the above steps (add together , divide sum by 2, or in other words, find the mean/average)

Mode - the most frequently occuring number in a set of data

eg. 3, 5, 7, 7, 9 mode: 7

eg. 2, 2, 4, 6, 6, 8, 11 mode: 2 and 6

eg. 1, 2, 3, 4 mode: none

eg. 1, 2, 2, 2, 3, 3, 4, 4 mode: 2

eg. 2, 3, 2, 3, 4, 2, 4, 3, 4
2, 2, 2, 3, 3, 3, 4, 4, 4 mode: none

Mean - a measure of central tendency
- the sum (adding) of a set of values divided by the number of values in a set

eg. 4, 5, 8, 9, 9
= 4 + 5 + 8 + 9 + 9 divided by 5 = 35 divided by 5
= 7 - this is the mean

Mean - A. K. A. - average

Try these, find Mean, Median, Mode.

A) 7, 8, 6, 9, 9, 5, 7, 7, 8 ,4

4, 5, 6, 7, 7, 7, 8, 8, 9, 9 median: 7 mode: 7 mean: 7

B) 300, 250, 400, 300, 250

250, 250, 300, 300, 400 median: 300 mode: 250 and 300 mean: 300

Here are some websites to give you some extra help if you're still stuck.

http://simon.cs.vt.edu/sosci/Site/MMM/mmm.html

Here is a link to a video that is catchy and helps to remember the mean, median, and mode.

Props to Julibella :). I saw the video on her post and it gave me the idea to use it.

### Measures of Central Tendancy

How to find the mean is by the sum(adding) of a set of values divided by the number of values in the set.
eg. 1+2+3=6/3 eg. 4,5,8,9,9
3 sets of values
=4+5+8+9+9/5
=35/5
=7<- this is the mean. a.k.a average
Try this mean, median, mode
A) 7,8,6,9,9,5,7,7,8,4

mean-7
median-7
mode-7
B) 300,250,300,300,400 pg.431-433 #2-16

-Here is a video about mean, median and mode. I hope it helps:)

### exam review

300 ugly kids were asked what is their favorite color. How many like blue? How many like green? How many like gold.

x3

blue 25/100 =75/300

x3

x3

green 300/100=90/300

x3

x3

gold 45/100=135/300

x3