Julie Ann Williams wants to find the due date that gives her company’s project a 99% chance of on-time completion.

APPROACH c She first needs to compute the Z-value corresponding to 99%, as shown in Figure 3.14.

Mathematically, this is similar to Example 10, except the unknown is now the due date rather than Z.

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Probability of 0.99 0 Probability of 0.01 2.33 Standardi Deviations Z 2.33