Calculate the uncertainty on the values of m

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Homework Statement

m
7.29
7.31
7.3
7.31
7.27
7.28
7.31
7.29
7.28
7.27
7.26
7.3
87.47
mean 7.289166667

using the values in the table calculate the uncertainties on the mean values of m

The Attempt at a Solution

I thought finding the difference between the different values of m and the mean value of m, adding them, and dividing by the number of values of m there are, but this doesn't seem right. Please help

 

[gneill]

They're probably looking for the Standard Error of the Mean. Take a look at the Examples section http://teacher.pas.rochester.edu/PHY_LABS/AppendixB/AppendixB.html" .