The Empirical Rule

What shape is a normal distribution curve?

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

What is the percentage of data that falls within one standard deviation of the mean?

• 67%

• 65%

• 72%

• 68%

What is the percentage of data that falls within two standard deviations of the mean?

• 68%

• 99.7%

• 95%

• 98%

What is the percentage of data that falls within three standard deviations of the mean?

• 99.7%

• 98.7%

• 95%

• 100%

The Empirical (68-95-99.7) Rule can be applied only if data is ....

• Normally Distributed

• Uniform

• Skewed

• Symmetric

The Empirical Rule's percents are:

• 68-95.7-99

• 68-95-99.7

• 68.7-95-99