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Sample mean
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The sample mean is the sum of all n measurements in a sample divided by n.   

Hit Autofill and Plot.

Sample mean = sum of values/10.

You can Clear and enter your own (ten) values and see the sample mean.

If we were to take a very large number (N ) of measurements we would obtain the true mean m, i.e. a number which approaches the true value of x.

In these examples, the uncertainty in each measurement is the same and is given by the standard deviation s, which may or may not be known.

We can get an estimate of s from the sample variance (s2), which we get from the spread in measured values about the mean ... next.


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