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Directions: Suppose the normal curve below is about the distribution of books in the library that are found to have an average length of pages and standard deviation. Answer the following using the distribution: -3 -2 -1 1 3 Z 110 230 350 470 590 710 830 X 1. What is the average length of pages of books in the library? 2. What is its standard deviation? 3. What is the z-score value of 230 pages? 4. What is the raw score of the standardized score z = 1.50? 5. What is the z-score of 450 pages? Lesson 9: The Probabilities and Percentiles Under the Normal Curve