A must-read for anyone who makes business decisions that have a major financial impact As the recent collapse on Wall Street shows we are often ill-equipped to deal with uncertainty & risk Yet every day we base our personal & business plans on uncertainties whether they be next month s sales next year s costs or tomorrow s stock price In The Flaw of Averages Sam Savage-known for his creative exposition of difficult subjects- describes common avoidable mistakes in assessing risk in the face of uncertainty Along the way he shows why plans based on average assumptions are wrong on average in areas as diverse as healthcare accounting the War on Terror & climate change In his chapter on Sex & the Central Limit Theorem he bravely grasps the literary third rail of gender differences Instead of statistical jargon Savage presents complex concepts in plain English In addition a tightly integrated web site contains numerous animations & simulations to further connect the seat of the reader s intellect to the seat of their pants The Flaw of Averages typically results when someone plugs a single number into a spreadsheet to represent an uncertain future quantity Savage finishes the book with a discussion of the emerging field of Probability Management which cures this problem though a new technology that can pack thousands of numbers into a single spreadsheet cell Praise for The Flaw of Averages Statistical uncertainties are pervasive in decisions we make every day in business government & our personal lives Sam Savage s lively & engaging book gives any interested reader the insight & the tools to deal effectively with those uncertainties I highly recommend The Flaw of Averages William J Perry Former US Secretary of Defense Enterprise analysis under uncertainty has long been an academic ideal In this profound & entertaining book Professor Savage shows how to make all this practical practicable & comprehensible -Harry Markowitz Nobel Laureate in Economics