# Room 43 Math 09

## Wednesday, October 13, 2010

## Monday, June 21, 2010

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

Label

Parallel

Intersection

Angle bisector Perpendicular bisector

## Friday, June 18, 2010

### 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

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,

*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

=

Mean -

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://www.mun.ca/educ/ed4361/virtual_academy/campus_a/losinskim/mean,median,mode.html

- 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 meanMean -

**A. K. A.**- averageTry 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://www.mun.ca/educ/ed4361/virtual_academy/campus_a/losinskim/mean,median,mode.html

__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.

http://www.youtube.com/watch?v=uydzT_WiRz4

Sorry it's a link, I couldn't get it to upload.

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

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

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

B) 300,250,300,300,400

http://www.youtube.com/watch?v=QH2obAPwfqk

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

*is by the***mean****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

**. a.k.a***mean***average**

Try this**mean, median, mode**A) 7,8,6,9,9,5,7,7,8,4

**mean**-7**median**-7**mode**-7B) 300,250,300,300,400

**pg.431-433 #2-16**http://www.youtube.com/watch?v=QH2obAPwfqk

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

### exam review

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