[clueless_student]

I had a lab for water displacement and it compared these two methods.

The first method was putting 1 sphere inside a graduated cylinder to find out it's volume.
(pretty simple and straightforward)


The second method was to put 10 spheres inside a graduated cylinder and then divide by 10 in order to find the average volume for a sphere.


My lab report says that the second method should be more precise (or reliable).  Turns out that according to my results, the second method was in fact more precise.  But now I have to figure out why and answer the question.  I can't seem to think of why the second method has more precision though?  any ideas? much appreciated.   

[Dan]

Hint: What is the accuracy of the measuring cylinder?