Chapter 5, Problem 10E

IQ Some IQ tests are standardized to a Normal model, with a mean of 100 and a standard deviation of 15.

1. a) Draw the model for these IQ scores. Clearly label it, showing what the 68–95–99.7 Rule predicts.
2. b) In what interval would you expect the central 95% of IQ scores to be found?
3. c) About what percent of people should have IQ scores above 115?
4. d) About what percent of people should have IQ scores between 70 and 85?
5. e) About what percent of people should have IQ scores above 130?