
 Intermediate Mean Value Theorem (Site not responding. Last check: 20071020) 
  It is useful in many areas of science to be able to find out not just the mean value of a function, but also to glean some idea of the absolute size of it too. 
  It is clear that the mean of two numbers could be zero, but the size, which is more often called the norm, of two numbers cannot. 
  Although the mean value is, perhaps, more intuitive and physically appealling, it is the RMS value which arises more frequently in applications. 
 metric.ma.ic.ac.uk /integration/applications/imvt/index.html (342 words) 
