A. Determining Proportions with z Scores Example 1: x ...
x is normal with mu of 100 and sigma of 15. Find the proportion of people who have IQs of 122 or higher. 1.47 .0708 15 122 100 = ⎯⎯→ = − chart Looking at the z score of 1.47, we go to part C of the chart, or the Proportion in the Tail, and determine that .0708 is beyond the x of 122. Thus, 7% have an IQ of 122 or higher. Example 2: ................
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