Uncertainty in Sound Recorder Measurements: Finding the Average and Range

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Homework Statement



I have this lab report due to tomorrow, but I'm stuck in this problem. My teacher asked me to find the uncertainty for the values, max+min/2. But, i get a huge number, how can that be the uncertainty?

Homework Equations



1- 154g 110 115 120
2- 208g 116 117 117
3- 137g 107 108 107
4- 145g 119 119 118
5- 155g 118 117 117
6- 149g 115 115 115

Those are my results for my experiment. 1,2,3 etc represent the blocks, and the numbers are the recording in decibel (dbl) sound recorder.


The Attempt at a Solution



If I do it according to her. Max+min/2 i should get for nr1. 120+110/2=115 ? is that ±115? How can that be the uncertainty? I also attempted to do Max-min/2 for nr1= 120-110/2= 5 so is that ±5?
 
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Discussion

max+min/2
should be (max - min)/2
This is a rough calculation of the spread in the data.
If you had more data, it would be worth doing the standard deviation, a more sophisticated measure of the spread in the data.
 
So how do i present this uncertainty? +- (answer here) or?
 
Yes, you would state the best value (the average) plus or minus the uncertainty.