Posted by **L** on Thursday, December 2, 2010 at 1:01am.

Okay I'm doing a lab report, and I need to find the average of two trials. Can someone show me step-by-step how do find the uncertainty for this average:

(4.32g+4.17g)/2

=4.25

The values I used and their uncertainties:

4.32g +/- 0.02

4.17g +/- 0.02

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