Thursday, May 5, 2011

Mean, Median and Mode

Mean is when you have a set of data, you add it up together and divide it by the amount of data you had.
Mode is when you order all the data from lowest to highest and choose the one right in the middle.
Median is when you tally mark them and see which has the most tallies.

Some advantages of Mean is that

  • It's easy to do even with bigger numbers. 
  • It's accurate and reliable
  • You look at the whole picture (equal weighting)
Some advantages of Mode is that
  • No calculator or calculations are needed
  • You see the majority
  • You see repetition
Some advantages of Median is that
  • You can find the data which occur most
  • It's easy to check if you went wrong somewhere
  • It discludes odd (weird) numbers
Though some of the disadvantages for Mean is
  • You need a calculator, normally too for small calculations (or it just takes longer)
  • If something goes wrong, you never know, and if you do you have to start all over again.
  • You can end up with a number with infinitive amount of decimals
Some disadvantages of Mode are that
  • Numbers which are odd (weird) they are discluded, which is a good thing sometimes, but sometimes not.
  • The Mode may not always be in the middle (eg. 4, 5, 5, 5, 8, 9, 10,10, 12, 12, 14, 15, 15 where 5 is the Mode)
Some disadvantages of Median are that

  • When you have number with decimal places it harder to even find any number which are the same
  • Number which are odd (weird) are discluded, which is a good thing sometimes, but sometimes not

Where can you find Mean

In Humanities, the GDP PP is in mean. The GDP PP is on average how much money one person urn in a country.

Where can you find Mode

When you want to order a group into two smaller groups. The taller once and the shorter once. Just find the Mode and split it up right at the sides of that person.

Where can you find Median

In a shop, where a shoe seller wants to know which size shoe he sells most so he knows which to order the most. 

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