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i've done the formula n everything, but what do the numbers actually show?
thank you 
Yeah, it's how far on average each value deviates from the mean. If you think about it, if each of the values were close to the mean (i.e. the standard deviation was quite small) then the data wouldn't be very spread out, but if they were generally very different from the mean (i.e. larger standard deviation) then the data would be more spread out. Basically what bexiness said 
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