Finding the average value of measurement and expressing the amnswer with correct significant figure

bruce's three measurements are 19cm,20cm, and 22cm . Calculate the average value of his measurements and express the answer with the correct number of significant figure?



The average is (19cm + 20cm +22cm) /3  = 20.33333

Bruce's measurements are to two significant figures so presumably the answer will be to two significant figures.

The average to two significant figures is 20cm.

 Check out the 'Significant Figures Calculator' at which is on the 'Jim's Useful Widgets' page of my website 


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Should Bruce's measurements be cubic centimetres and not centimetres?