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Classical Uncertainty

Suppose we are using a force gauge to measure gravity in a planet.

We set the gauge force to the 1N range which has a resolution of .01 N.

From its specs the error introduced during the measurment at the 1N range is 2*10^-3*reading+10^-3*range.

Now suppose we perform 5 different measurements:

Measurement  Value
1            0.49
2            0.5
3            0.48
4            0.51
5            0.5

Now in order to find uncertainty of type B we need 1 measurement and the specs of the instrument.But which 1 of the 5 measurements should I choose?