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

Probability Question.

What is the probability of spinning a blue on the spinner below?

Express as a fraction, ratio and a percent.

Orders of Operations

B-brackets. ( )

E- exponents. a²

D-division. ÷

M-multiplication. X

A-addition. +

S-subtraction. -

Now these are the Rules:

Rule 1- First you check to see if there is any brackets in the math question.

Rule 2- Then you check if there is any exponents in the math question.

Rule 3- Now if there is division or multiplication start from left to right.
Rule 4- Last but not least if there is addition or subtraction start from left to right.

EG.

2+3X4=

\ /

2+12=

\ /

14=

Here is a video to help you on BEDMAS

Click on this LINK to play
Homework:

1.

Annie has asked to calculate 1.7 + 6 ÷ 2. She claims the answer is 3.85. Do you agree? Explain why or why not.

1.7+6÷2

1.7+ 3 (since 6÷2=3)

1.7+3=4.7

2.Put brackets in the following expression to get the largest value possible. What problem strategy did you use?

3 X (2.8) + 6.4÷4)=10

3. Create a problem that could be solved using the following expression.

Anthony goes to the store to get a sandwich the sandwich is $3.50,he also took a juice box the juice box is $1.50 he also took 1 granola bar for $1.75 each and he also took a bag of chips, the chips cost 1.50. What is the total of Anthony's purchase going to be?

3.5 + 1.5+ 1.5 X 1.6=

3.5 + 1.5+2.4=

5+2.4=

7.4=

Test correction for number 8.

Question:

In which quadrant is the point with coordinates (3,8)?

a)quadrant 1 c)quadrant 3

b)quadrant 2 d)quadrant 4

Answer: A

If you want to practice on plotting points

Click on this link.