How can I show average votes of fivestar nodes?
Consider a table similar to this one:



The Views Calc module can be used to transform that table so that the calculations in the last rows (with Count, Sum and Max) get added to it. So that the table looks similar this:



By replacing the columns '# Fish', 'Weight' and 'Big Fish' in the example above with 'field1', 'field2' and 'field3' (as in the question), and by asking for the 'average' to be added (instead of Count, Sum or Max), it should answer the question I think, no?

To ask for the 'average', just select it from the selection list as shown in this screenshot (instead of the ones selected in that screenshot):



For more details (step-by-step instructions), refer to the community documentation about the Views Calc module.