I have a graph where I show number of boxes that a machine can service per minute. The data may not always give a whole number (for example, a machine may be able to service 2.3 boxes / per minute).
I am wondering how to label the axes on this graph.
I have observed that number tends to be used for integer quantities (for instance, number of people, or *number of potatoes), whereas amount is used for uncountable quantities, that often have fractions (such as 1.5 gallons of paint).
Which should I use to label my graph, number of boxes or amount of boxes?