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Based on data from the 2000 Census the average age of a Baldwin County, Alabama resident is 39...

Question:

Based on data from the 2000 Census the average age of a Baldwin County, Alabama resident is {eq}39 {/eq} years with a standard deviation of {eq}22.6 {/eq}. The data is normally distributed. The median age, in years, is: {eq}\rule{1cm}{0.15mm} {/eq}.

Properties of Standard Normal Distribution:

Standard normal distribution, also known as Gaussian distribution, is most common and widely used type of continuous distribution with a mean of zero and standard deviation of one. The distribution is symmetric about the mean zero and gives a bell-shaped curve when plotted on a graph.

Answer and Explanation:

The median age in years is 39 years. According to properties of standard normal distribution, the mean, median and mode are all equal. Since age is normally distributed with a mean of 39 years, the median of the distribution will also be 39 years.


Learn more about this topic:

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Using the Normal Distribution: Practice Problems

from Statistics 101: Principles of Statistics

Chapter 6 / Lesson 9
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