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Derivation of mean, mode, and median:

Mathematics
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Mean = sum of observations divided by the number of observations. Mode = the observation that occurs most frequently. Median = value of the middle observation if uneven number of observations, or the average of the two middle if even number of observations
OH yes I know :) but I want the derivation of those scary looking formulas in case of continuous series (grouped data)
hmm, okay - back to Mum for me ;)

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Other answers:

The one that uses cumulative frequency an all. Sure thing tell her I said "HI" and thanks in advance :)
haha, will do. Sorry I didn't ask correctly the first time ;)
No problem :)
Median = value of the middle observation if uneven number of observations, or the average of the two middle if even number of *sorted* observations ;)
http://letmegooglethat.com/?q=what+is+the+definition+of+mean+median+and+mode
lol

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