ABSTRACT
In this chapter we shall discuss the calculation of some simple, but important, statistical measures. We shall also describe some simple mathematical techniques, which simplify the calculations of these measures, and which we shall need to use later in the book. Some of these techniques will be familiar to those who can remember the mathematics they learnt at school, while others will be new to many people, and are therefore explained at some length. The concepts of statistics could, it should be said, be explained without the use of one or two of these mathematical techniques, but to do this would lead to unnecessary complications and to long-winded explanations of simple points.
