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Question 17:

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No answer provided yet.The percentage tells you how much area is above or below that point on a normal curve. That by itself doesnít help much of course. The percent of area tells you how unusual an event is. For example, if you knew that the z-score of someoneís test was a z of 2.5, this percentage tells you that score is in the 99th percentile.

In other words itís a very high score, and an unusual event. Usual events will fall closer to 50%. In fact the properties of the normal curve dictate that 68% of the values will fall within 1 standard deviation (plus and minus) of the mean. In other words, if test scores were normally distributed, about 70% of the test takers will fall within 1 standard deviation of the average.

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