Tuesday, June 7, 2011

Measures of Central Tendaency


-value that represents the centre 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 greater
. 2,3,4,5,6,5,4,5,3,4,5,6,7,5,34,3 hours of studying

2,3,3,3,4,4,4,5,5,5,5,5,6,6,7,34

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







Mode- the frequently occurring number in a set of data

hint: mode and most have 4 numbers

eg. mode of 3,6,7,7,9 is 7

Mean- a measure of a central tendency, the sum of the set of value divided by the number of values in the set

eg. mean of 6,4,8 is 6

add up all the numbers divided that by how many numbers there are.

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

here's a link if you didnt understand this
https://

5 comments:

Kamille817 said...

Hi Melody! I like your scribe post~ Very well done. The definitions really helped me a lot. The examples also made me understand more about Measures of central tendency. To make your post even better, I suggest you change font size, color, and color (to makes it really attractive!). I also think you should put more pictures. Other than that, it's great! Here's another link and video that you could put:
LINK: http://ca.ixl.com/math/grade-7/mean-median-mode-and-range-find-the-missing-number
VIDEO:http://www.youtube.com/watch?v=oNdVynH6hcY&feature=related

randolph814 said...

Hi Melody! I'd really like your scribe post. You understand very well. I'd suggest you to change the font, size, and color font. Well just like Kamille said to you that you should put more pictures but your scribe post is really good. See you at school on Monday! :)

aaron873 said...

Hi Melody! I really like your scribe post. Its very organized but i think you used to much space. I like your video and you link but on mine i cant see it. i like how you put colour on your topics like outlier but you could have did the whole thing you could have also made your font bigger. I also have a different link for you
Well GOOD JOB MELODY:)

Here is the other link

LINK: http://ca.ixl.com/math/grade-7/mean-median-mode-and-range-find-the-missing-number

beverly814 said...

Hi Melody, great scribe post. I liked how you organized everything and put it in color so that it's easier for us to read. I think you should made your font a little bigger we could all see what your trying to say. You should try adding for pictures to make us understand more on measures of central tendency.

Here is a link that I found for you:
http://www.saskschools.ca/curr_content/elemath/lesson6/workingwith.htm

irena814 said...

Hi Melody, great scribe post! Your post was very well organized and easy to read. I liked how you different colors for the font. It made it really stand out. But next time, I think you should edit your post before you publish it. You forgot to the the word 'difference' between the word positive and the word between. I also noticed that you forgot to give us the answers to two of your examples. The range of 1, 3, 4, 5, 5, 6, 6, 8, 8, 9, is 8. And the answer to you last example is 1 and 100. (Those are your outliers)