AP Psychology Question---Please Help?

Question

Hey everyone, I need to know an answer to a question and i have been trying to figure it out for many days now. So if you could help me with this question, i will greatly appreciate it! Thanksin advance

The Question-

An intelligence test for which the scores are normally distributed has a mean of 100 and a standard deviation of 15. Use this information to describe how the scores are distributrd.

Thank you so much!

Answer 1

Well, what this means is that most people scored between 1 standard deviation below the mean (in other words 100-15 or 85) and 1 standard deviation above the mean (100+15 or 115).  That's because intelligence scores are normally distributed.  That is, the distribution of scores looks like the familiar "bell curve".  If you have a picture of a bell curve, or normal distribution the picture would indicate that you'll find about 68% of the population have a score that falls between one standard deviation above and one standard deviation below the mean.  So about 68% of people have a score between 85 and 115.

Hope this helps!

Michael

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