Statistics 1 corresponds to unit S1. It covers representation of data, permutations and combination, probability, discrete random variables and the normal distribution. This book is a part of series of textbooks created for the new University of Cambridge International Examination (CIE) AS and A Level Mathematics syllabus. The authors have worked with CIE to assure that the content matches the syllabus and is pitched at a suitable level. Each book corresponds to one syllabus unit, except that units P2 and P3 are contained in a single book.