Wednesday, May 26, 2010
The Best Measure of Central Tendency
Tuesday, May 25, 2010
Choose the Best Measure of Central Tendency
Wednesday, May 19, 2010
Range and Outliers
eg. 6,2,9,4,3 Re-order the data set.
2,3,4,6,9 Subtract smaller value from larger value.
9 - 2 = 7. 7 is your range.
eg. -8,-1,-3,-5 Re-order the data set.
-8,-5,-3,-1 Subtract smaller value from larger value.
(-8) - (-1) = 7
Outlier - A value that is much smaller or larger than the other data values, or the "outcast".
-A data set may have one or more outliers or no outliers at all.
Try to find the Range of the following.
a). 7,4,3,6,2,5,8,3 b).11,8,8,5,7,6,7,6,6 c). -4,3,-1,0,2
Try to find the Outlier of the following.
a). 18,19,79,17,20,12 b). 14,14,16,15,1,16 c). 98,202,99,91,2,95,89,88,94
Watch this video to learn more about Range and Outlier.
http://www.youtube.com/watch?v=GnIP69AnkDQ&feature=related
Thank you for reading my post.
Please leave a comment on anything I did wrong or think I should add next time.
Range -The positive difference between the largest and smallest values in a data set.
Eg. 6, 2, 9, 4, 3 - data set
2, 3, 4, 6, 9 - ordered from least to greatest
9 - 2 = 7
The range is 7
Example: -8, -1, -3, -5
-8, -5, -3, -1
(-1) - (8) = 7
The range is 7
A data set may have one or more outliers or no outliers
* It's like,finding something that doesn't belong
Find the range of the following
a) 7, 4, 3, 6, 2, 5, 8, 3
2, 3, 3, 4, 5, 6, 7, 8
8 - 2 = 6
The range is 6
b) 11, 8, 8, 5, 7, 6, 7, 6, 6
5, 6, 6, 6, 7, 7, 8, 8, 11
11 - 5 = 6
The range is 6
c) -4, 3, -1 , 0, 2
-4, -1, 0, 2, 3
3 - (-4) = 7
The range is 7
Find the outliers of the following
a) 18, 19, 79, 17, 20, 12 - 12, 17, 18, 19, 20, 79 - The range is 79
b) 14, 14, 16, 15, 1, 16 - 1, 14, 14, 15, 16, 16 - The range is 1
c) 98, 202, 99, 91, 2, 95, 89, 88, 94 - 2, 88, 89, 91, 94, 95, 98, 99, 202- The range is 2 and 202
Monday, May 17, 2010
The Mean
Mean- is a measurement of central tendency.
- the sum ( answer of addition) of a set of values divided by the number of values in a set or to put in a simple way, add all the numbers given and divide in how many you've add.
- AKA. Getting the average
eg. 4,5,8,99
= 4+5+8+9+9
__________
5
= 35
___
5
= 7
Try This:
A) 7,8,6,9,9,5,7,7,8,4
B) 300,250,400,300,250
The meaning of mean
eg.; 4, 5, 8, 9, 9
a.k.a ; average
To refresh your memory:
Mode means the most frequently occurring number in a set of data.
Median means the middle number in a set of data after the data has be arranger or reordered.
Try these (Find mode, median and mean):
a) 4, 5, 6, 7, 7, 7, 8, 8, 9, 9
b) 250, 250, 300, 300, 400
Compare your answers to these:
a) mode = 7 median = 7 mean = 7
b) mode = 250 & 300 median = 300 mean = 300
Homework: Math Links; Page-431, 433 #1-16
Here are some videos:
PS: KC chiefs & Isfeld are the best :D !
Beat that stand up boy ;)
Friday, May 14, 2010
Homework and extra practice
Try some of these problems for extra practice:
Working With Data1. List all the four-digit numbers that are even, have a 6 in the tens place, and whose digits add to 12. 2. Is 349 ´ 0.9 greater than, less than, or equal to 349? How do you know? ______________________________________________________________ ______________________________________________________________
3. Suppose you know that 48 ÷ 16 = 3. Without finding the exact answer, tell whether the answer to 48 ÷ 15.99 is greater than, less than, or equal to 3. Why? ______________________________________________________________ ______________________________________________________________
4. Use the multiplication below to answer the questions that follow. a) Can E be 2? Explain. ___________________________________________________________ ___________________________________________________________ b) What is the value of D? Why? ___________________________________________________________ ___________________________________________________________ c) What is the value of G? How do you know? ___________________________________________________________ ___________________________________________________________
Tuesday, May 11, 2010
Algebra, T - Chart, and Linear Graph
a cabin with 2 rooms has 5 doors, and a cabin with 3 rooms
has 8 doors.
Draw the next 2 cabins.
How many doors will a cabin with 10 rooms have?
~ 3x - 1 = y
2.) For this linear relationship y = 2x - 1. Complete
the following table of values.
Create a graph representing these values.
Describe a pattern in real life that the linear relation
y = 2x - 1 could represent. Make sure you explain what
both x and y represent.
eg.
There's a bag of chip that costs $2.00. I bought 2 bags of chip
(let's just say I bought 2 bags). I multiplied it by 2.
Then I remembered I have a coupon worth $1.00 off.
3 = 2(2) -1
HERE ARE SOME VIDEOS TO HELP YOU!
(Sorry guys, I can't put the video directly to this post.
The computer said it's an error page.)
http://www.youtube.com/watch?v=W7fPsSw74TM
http://www.youtube.com/watch?v=VMZ9Zy6q6Iw&feature=related
http://www.youtube.com/watch?v=VAJRj8hST1c
SOLVE FOR HOMEWORK!
a.) 10 = x + 6 b.) x + 6 = 8 c.) x - 2 = 9 d.) x - 4 = 5
e.) 2x + 1 = 7 f.) 4x - 2 = 12 g.) x / 4 + 3 = 9 h.) x / 6 - 5 = 1
Tuesday, May 4, 2010
Solving Two-Step Algebraic Equations
1.2t + 3=$19
If the sunglasses cost $7 how much are the t-shirts?
2t + 7 =$19
-7 -7
2t + 12
─ ─
2 2
t=6
Check answer:
2(6) +7 = 19
12 +7=19
19+19
Chick saw a sign ,buy two pants and get socks for 4 pairs of socks. If she pays $30 for 2 pants and 4 socks.What is the price of a pair of pants?
Model using blocks on a scale
For short:
2p + 8 = 30
-8 -8
2p + 22
─ ─
2 2
p= 11
Check your answer:
2p+8= 30
2(11) +8+30
22 + 8 = 30
30=30
Now try these:
3w+ 3 =6 2n +4= 10
-3 -3 -4 -4
3w +3 2n = 6
─ ─ ─ ─
3 3 2 2
w = 1 n = 3
To enhance your learning, watch this video!