Austin's Measures of Central Tendency

Sunday, September 28, 2008

Mean

  • arrange the data in ascending order
  • the sum of data divided by how many numbers there are in the data
  • with an outlier the mean is less accurate (average)
1 2 3 4 5
1+2+3+4+5=15
15 divided by 5 equals 3
3 is the mean

  • arrange the data in ascending order
  • the middle number in a set of data
  • if there are 2 middle numbers you find the mean of them
  • great to use when there is an outlier
1 2 3 4 5
1 5
2 4
3
3 is the median

Mode

  • arrange the data in ascending order
  • the most frequently used number in the data
  • the data that appears the most
  • you can have more than one mode
  • you can have no mode

1 2 3 3 4

3 appears the most

3 is the mode

Range

  • arrange the data in ascending order
  • subtract the smallest data from the largest data
  • large range = outlier
1 2 3 4 5
5 is the largest number
1 is the smallest number
5-1=4
4 is the range

This is a video that I found on youtube that had to do with mean, median, and mode.



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