1. Normal Distribution

2. In a normal distribution:
2.35
2.35
.15
.15
In a normal distribution:
--68% of the data fall within one SD of the mean
--95% of the data fall within two SD of the mean
--99.7% of the data fall within three SD of the mean

3. For a population of male European eels, the mean body length is 15
For a population of male European eels, the mean body length is 15.7 in. The standard deviation is 2.8 in. Sketch a normal curve showing eel lengths at one, two, and three standard deviations from the mean.
Sketch a Normal Curve

4. Analyzing a Normal Distribution
The heights of adult American males are approximately normally distributed with mean in and SD 2.5 in.
What % are between 67 in and 74.5 in tall?
Given a group of 2000 males, about how many would you expect to be taller than 6 ft?
Analyzing a Normal Distribution

5. The scores on the Algebra II final are approximately normally distributed with a mean of 150 and SD of 15.
What % of students scored above 180?
What % of students scored below 135?
What % of students scored between 120 and 165?
If 250 students took the test, how many scored above 135?
Practice