Defining the Acceptable Range of variation Acceptable o upper limit Acceptable Standard range of variation 5 Acceptable● E lower limit t2t+3t+4t+5 Fiqure 18-3Defining the Acceptable Range of Variation Standard Acceptable upper limit Acceptable lower limit Measurement of Performance t t+1 t+2 t+3 t+4 t+5 Acceptable range of variation Figure 18-3