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# When do you use mean or median? (S1) watch

1. When do you use mean or median? And when does it not matter?

Thanks
2. What is the mean number of legs a person has?
3. (Original post by vdub)
What is the mean number of legs a person has?
In theory just under 2 (if you include everyone in the world)...what does this have to do with my question? or does it have something to do with whether or not you include extreme values?
4. Median if data is skewed, positive/negatively skewed
Mean if not skewed-symmetrical
5. In that case the mode would be best. It's much more efficient to say a person has 2 legs than say 1.999. Income it is good to use the median, so extremely rich people don't give the impression that the average person earns 50k or whatever
6. (Original post by matt_copas)
And when does it not matter?

Thanks
When the data is normally distributed.

Mean=median=mode.

Have a look at this,

Might give you some idea when should you use what.

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