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• Semiconductor Wafers and Location The wafers in Example 2-19were further classifi ed by the degree of contamination. Table 2-2shows the proportion of wafers in each category.

– What is the probability that a wafer was either at the edge or that itcontains four or more particles? Let E1 denote the event that a wafer

contains four or more particles, and let E2 denote the event that awafer was at the edge. – What is the probability that a wafer contains less than two particles or

that it is both at the edge and contains more than four particles? LetE1 denote the event that a wafer contains less than two particles, andlet E2 denote the event that a wafer is both at the edge and contains

more than four particles.

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