RichH - 2:41 pm on Mar 14, 2013 (gmt 0)
Average is actually quite a murky term.
Most people think it means "mean" (sum of values in a series divided by the number of values). However, it can also mean "median" (the value in a series which has an equal number of values above and below it), or "mode" (the most common value in a series).
Very true. Just as a brief note in case anyone finds it useful, where you're trying to calculate an average but are dealing with a series of values that may contain "rogue" items (like being on page 1 for one hour but then page 47 for twenty-three hours, or perhaps having one page of your site at #1 but many others far below) it's better to use an average calculation called the Geometric Mean. You multiply all the numbers together and take the nth root of the product, where "n" is the number of values.