7-11

Measurement of Central Tendancy

Mode - the frequently occurring number in a set of data
mode and most have 4 numbers
- mode of 3,5,7,7,9 is 7
- mode of, 2, 4, 6, 6, 8, 11 is 2 and 6
- mode of 1, 2, 3, 5 is no mode
- mode of 1, 1, 1, 2, 2, 2, 3, 3, 3 is no mode
- mode of 1, 1, 1, 2, 2, 2, 3, 3, 3, 4 is 1, 2 and 3

Mean - a measure of a central tendency, the sum of the set of value divided by the number of values in the set (add up all the numbers, divide that by how many numbers there in the set.)
- mean of 6,4,8 is 6
4,6,8
4+6+8=18

Range - The positive between the largest and smallest values in a data set
- range of 1,3,4,5,5,6,6,8,8,9
9 - 1 = 8
- range of -7, -4, -2, -1
(-1) - (-7) = 6

Outlier - a value that is much larger or smaller then the other data value
the data set may have more then 1 outlier or 0 outliers
outliers are 1,67,67,67,65,100 - 1 and 100

Here is a link/game on calculating median, mode, mean and range
Here is a video:

Math Practice Questions

Convert the following written statements to mathematical:

1) 3 less the fish John had is 18.
2) Matt is a quarter of his dad's age, his dad's age is 48.
3) The dog is three times older then Annie, her age is 15.
4) Jane's height is three times less than her brother's height, his height is 6.
5) The phone calls from yesterday was 9 times more today and the calls were 108.

Solve the following algebric equations:

1) 5n = 200
2) n + 26 = 40
3) 2n - 27 = 11
4) n + 5 = 18
5) 2n + 18 = 26

Hope these questions will help you!

Here's a link on Algebraic Equations. Sorry I couldn't add a video, it wouldn't let me add one.

Measures of Central Tendency

Measures of Central Tendency
-A value that represents the center of a data set
-Can be the mean,median, or mode

Data Set- is a number that you must arrange in order from least to greatest

Median- the middle number in a set of data after the data have been arranged in ordereg.
median of 2,5,6,8,9 is 6

Mode- the frequently occurring number in a set of data
mode and most have 4 numbers
-mode of 3,5,7,7,9 is 7
-mode of, 2, 4, 6, 6, 8, 11 is 2 and 6
-mode of 1, 2, 3, 5 is no mode
-mode of 1, 1, 1, 2, 2, 2, 3, 3, 3 is no mode
-mode of 1, 1, 1, 2, 2, 2, 3, 3, 3, 4 is 1, 2 and 3

Mean- a measure of a central tendency, the sum of the set of value divided by the number of values in the set
mean of 6,4,8 is 6
4,6,8
4+6+8=18

Range-The positive between the largest and smallest values in a data set
Range of 4,5,5,6,9,1,3,5,8,6
1,3,4,5,5,6,6,8,8,9

Outlier-a value that is much larger or smaller then the other data value
the data set may have more then 1 outlier or 0 outliers
outliers are 1,67,67,67,65,100

Heres a video!
http://youtu.be/81zcjULlh58

Heres a link!
http://www.basic-mathematics.com/measures-of-central-tendency.html

Math Exam Review

Probability - the likelihood of a chance or an event occurring.

P: heads rolling a 4 with a regular die

Experimental probability - actually doing the trails
Theoretical probability - what you expect to happen
They might be the same, they might be different.

Factors of 32 - 1, 2, 4, 8, 16, 32 Factors of 56 - 1, 2, 4, 7, 8, 14, 28, 56

Here is a game/link on probability.
Here is a video :

Math Exam Review last page

In class we talked about our exams

Variable-is a unknown number

expression contains variables, operations, and numbers, i

n any combination.

practice finding the pattern

eg. 24, 21, 18, 15

and write equations for the p

atterns

eg. 27-3n

Plot ordered pairs and determine whether or not they make a pattern

determine the linear relation (equation) from a graph or table of values

Mean-add up all values divide by how many values there are

Median- the middle number in a set of ordered values, might be the mean of 2 middle values

mode- the value that shows up the most

Range- positive difference between largest and smalle

st values

big one take away little one

Outlier-values that are too big or too small compared to the other values

Write expressions or equations when given pictures

eg.

2c+3=21

Convert written statements to mathematical statements

eg. Jim is one third his brothers age and his brother is 12

J=12/3

Solve algebraic equations

Here is a link to help http://www.gamequarium.com/prealgebra.html

Here is a video to help

Here is a link

todays math review

today in math we talked about many things first of all we reviewed circle formulashttp://www.blogger.com/img/blank.gif
variables: c= circumfurance (the Distance around) d= diameter( from one side through the middle to the other) r= radius (half the diameterhttp://www.blogger.com/img/blank.gif) A= area (space it takes up) pi= 3.14http://www.blogger.com/img/blank.gif

fomulas: c=pi times d d=2 times r r= diameter divided by 2 A= pi times radius squared (times it self)

eg. if d = 6 then the radius is 3 and the circumfirence is 18.84 so the area must be 113.04.

the anwser is 314

Integer Review

This is an exam review for integers

Negetive number represent values below 0 and positive number represent values above 0.

Real life examples are sea level (above or below sea level) and temperature (above or below 0 degrees)

1+(-2)=(-1) is a addition statement

3-(-1)=4 is a subtraction statement

Opposite Integers have the same numeral but different sign Eg. 3 and (-3)

Know what a (+)+(+)= + (-)+(-)= - (+)+(-)= + or - (-)+(+)= + or - (+)-(+)= + or - (-)-(-)= + or - (+)-(-)= + (-)-(+)= -

Pratice with different numerals in each situation

Write an addition statement for the following diagram

5+(-12)+4=(-3)

Take this quiz to see how much you know about integers.

Tuesday, June 14, 2011