How do I use the 68-95-99.7 rule?

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Some IQ tests are standardized to a normal model with a mean of 100 and a standard deviation of 16.  Be sure to use proper notation for the questions.

1. draw a model for the IQ scores that show what 68-95-99.7 rule predicts.

2. In what interval would you expect 95% of IQ scores?

3. What % of people will have IQ above 16?

4. what % of people will have IQ between 68 & 84?

5. What % of people should have IQ above 132?

Oct 5th, 2015

Thank you for the opportunity to help you with your question!

Diagram attached

2. 95% of score would lie within 2 deviations of the mean (either side)

In other words, the IQ of 95% of people  will be in the interval 84 -132

3. 100%

4. See diagram 13.6%

5. See diagram 2.2%

Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 5th, 2015

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Oct 5th, 2015
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Oct 5th, 2015
Sep 25th, 2017
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