Objective: To introduce the characteristics of normal distribution curve. Standard 5.10.

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Presentation transcript:

Objective: To introduce the characteristics of normal distribution curve. Standard 5.10

Real life examples 1. the distribution of heights of people in USA is normal distribution. 2. the distribution of light bills of residents of South Carolina is normal distribution.

Characteristics bell-shaped symmetric about mean mean, median, mode equal Continuous distribution Never touch the x-axis Area under curve is 1 unimodal

Why is normal distribution important in statistical analysis? Many variables are normally distributed, and the distribution can be used to describe these variables.

What is the total area under the normal distribution curve?

What percentage of area falls below the mean? Above the mean? 50%; 50%