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Question 334:



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You're looking for the z-value for 80% of the area under the curve. Use the percentile to z-score calculator and select 1-sided area for .80. You should get a z-score of 0.8419.

You can visualize this by looking at the interactive graph of the standard normal curve (see the second graph for 1-sided area). Hover over the curve until it shows "white-area" to be 20% and you should se approx a z-score of .84.

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