High School Calculating Uncertainty of Mean Values for Enthalpy Change Measurements

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To calculate the uncertainty of the mean for the enthalpy change measurements of alcohols, the rules for propagation of uncertainties should be applied. The values provided are independent measurements: −283 ± 11, −175 ± 9, and −282 ± 11. It is suggested that averaging these values may not be appropriate if they are not measurements of the same quantity. The discussion highlights the importance of understanding the context of the measurements before averaging. Proper calculation of uncertainty is crucial for accurate scientific reporting.
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I am trying to find the uncertainty of the mean of 3 values.
These values were calculated from experiments to calculate the enthalpy change of various alcohols.
These values are independent values.

−283 ± 11, −175 ± 9, −282 ± 11

How would I calculate the uncertainty of these values?
Thank you.
 
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If those numbers are supposed to be measurements of the same thing, I wouldn't average them. Do you know why?
 

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