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# standard deviation question watch

1. When calculating the mean for results you have to round the mean either up or down depending upon the number of significant figures that you recorded your results in, right?
So, for example, if you had results of 8, 8 and 9 and your mean was 8.3, you would round it down to 8 right?

But then when you do standard deviation on the calculator it uses 8.3 so surely the standard deviation doesn't correspond to the mean that you wrote down? Does that mean your leave the mean as 8.3 in the first place?
Thanks
2. (Original post by heshop)
When calculating the mean for results you have to round the mean either up or down depending upon the number of significant figures that you recorded your results in, right?
So, for example, if you had results of 8, 8 and 9 and your mean was 8.3, you would round it down to 8 right?

But then when you do standard deviation on the calculator it uses 8.3 so surely the standard deviation doesn't correspond to the mean that you wrote down? Does that mean your leave the mean as 8.3 in the first place?
Thanks
You can quote the mean to more significant figures (within reason)

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Updated: March 25, 2013
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