Normal Distribution Curve

The normal curve is symmetrical about the mean.

• True
• False

What percentage of data falls within 1 standard deviation? 

• 25%

• 68%

• 95%

• 99.7%

How much of the data falls within 3 standard deviations? 

• 25%

• 68%

• 95%

• 99.7%

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

• 100
• 25
• .5
• 1

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.

If this is the graph of data normally distributed with a mean of 30 and a standard deviation of 5, what label (number) is written at the blue circle?

• 40

• 35

• 45

• 50

What shape is a normal distribution curve?

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

Which is a normal distribution graph?

• 
• 
• 
• 

Any normal probability distribution can be converted to the standard normal probability distribution by the following formula

Find the value for 
P(Z > 1.78)

• 0.0376
• 0.0375
• 0.0446
• 0.2420