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 Þ ¥)
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 (s^{2}),
which we get from the spread in measured values about the mean ... next.
