Normal Distribution Symmetry

Which best describes the shaded part of this normal distribution graph?  

• All data that is one or higher.
• All data that is one or more standard deviations above the mean.
• All data that is between 1 and 3.
• All data that is above the mean.

What is the the total area under the standard normal distribution curve?

• 100
• 25
• .5
• 1

Which is NOT true about the standard normal distribution?

• It is bell-shaped.
• It is unimodal.
• The mean is 0 and the standard deviation is 1.
• It is asymmetrical.

If the shaded area under the curve is .85, what is the other missing portion of the curve?

• .26
• .15
• .30
• .17

The normal curve is symmetrical about the mean.

• True
• False

What shape is a normal distribution curve?

• Half curve
• Round curve
• Bell curve
• Square curve

1.  Which best describes the shaded part of this normal distribution graph?  

• All data that is one or higher.
• All data that is one or more standard deviations above the mean.
• All data that is between 1 and 3.
• All data that is above the mean.

At a local high school, GPA's are normally distributed with a mean of 2.9 and standard deviation of 0.6. What percentage of students at the high school have a GPA between 2.3 and 3.5?

• 68%
• 99.7%
• 95%
• 84%

In a population, if μ=125 and σ=25, how common are values in the 100 – 175 range?

• 68%
• 84%
• 81.5%
• 95%

What is the standard deviation of the distribution?

• 1010
• 20
• 60
• √20