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Bessie · Answer 1 · 2019-05-02T13:46:53+0000

The 90th percentile refers to the value above 90 percent of the data. This is illustrated in the figure.

Using a z-table(also attached) or a technology, we can solve that z=1.28.

For the standard normal curve, find the z-score that corresponds to the 90th percentile-example-1

For the standard normal curve, find the z-score that corresponds to the 90th percentile-example-2

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