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**5.3 Normal Distributions: Finding Values**

Find a z-score given the area under the normal curve Transform a z-score to an x-value Find a specific data value of a normal distribution given the probability

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**Try it yourself 1 -1.77 -1.96 and 1.96 Finding a z-Score Given an Area**

Find the z-score that has 96.16% of the distribution’s area to the right. Find the z-score for which 95% of the distributions area lies between –z and z. -1.77 -1.96 and 1.96

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Try it yourself 2 Finding a z-Score Given a Percentile Find the z-score that corresponds to each percentile. P₁₀ P₂₀ P₉₉ -1.28 -0.84 2.33

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**Transforming a z-Score to an x-Value**

To transform a standard z- score to a data value x in a given population, use the formula x = µ+zα

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Try it yourself 3 Finding an x-Value Corresponding to a z-Score A veterinarian records the weights of dogs treated at a clinic. The weights are normally distributed, with a mean of 52 pounds and a standard deviation of 15 pounds. Find the weights x corresponding to z-scores of -2.33, 3.10, and Interpret your results. 17.05, 98.5, and 60.7

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**Try it yourself 4 116.93 feet Finding a Specific Data Value**

The braking distances of a sample of Nissan Altimas are normally distributed, with a mean of 129 feet and a standard deviation of feet. What is the longest braking distance one of these Nissan Altimas could have and still be in the bottom 1%? feet

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**Try it yourself 5 8.512 years Finding a Specific Data Value**

The lengths of time employees have worked at a corporation are normally distributed, with a mean of 11.2 years and a standard deviation of 2.1 years. In a company cutback, the lowest 10% in seniority are laid off. What is the maximum length of time an employee could have worked and still be laid off? 8.512 years

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Chapter Normal Probability Distributions 1 of 105 5 © 2012 Pearson Education, Inc. All rights reserved. Edited by Tonya Jagoe.

Chapter Normal Probability Distributions 1 of 105 5 © 2012 Pearson Education, Inc. All rights reserved. Edited by Tonya Jagoe.

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