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Example 4 - closer to 0.1003 which corresponds to a z-score...

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Example 2 Using the previous example, what purchase amount marks the lower 10 percent of the distribution? Locate in Table the probability of 0.1000, or as close as you can find, and read off the corresponding  z -score. The figure that you seek lies between the tabled probabilities of 0.0985 and 0.1003, but 
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Unformatted text preview: closer to 0.1003, which corresponds to a z-score of –1.28. Now, use the z formula, this time solving for x : Approximately 10 percent of the purchases were below $6.12....
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