The Empirical Rule

Multiple Choice

What percent of people within 1 standard deviation of the mean?

• 99.7

• 34

• 68

• 95

Multiple Choice

What percent of people within 2 standard deviations of the mean?

• 99.7

• 34

• 68

• 95

Multiple Choice

What percent of people within 3 standard deviations of the mean?

• 99.7

• 34

• 68

• 95

Multiple Choice

Which interval shows 68% of the data given a mean of 15 and a standard deviation of 3? 

• 9 to 21

• 12 to 18

• 6 to 24

• 13 to 16

Multiple Choice

Which interval shows 95% of the data given a mean of 15 and a standard deviation of 3? 

• 9 to 21

• 12 to 18

• 6 to 24

• 13 to 16

Multiple Choice

Which interval shows 99.7% of the data given a mean of 15 and a standard deviation of 3?

• 9 to 21

• 12 to 18

• 6 to 24

• 13 to 16

Multiple Choice

What shape is a normal distribution curve?

• Half curve

• Round curve

• Bell curve

• Square curve

Multiple Choice

Which of the following is a disadvantage of the Empirical Rule?

• There is no result for 3 standard deviations.

• It is very conservative.

• There is no result for 1 standard deviation.

• The data has to be approximately normal.

Multiple Choice

In the diagram, the shaded area represents approximately 95% of the scores on a standardized test. If these scores range from 78 to 92, which could be the standard deviation?

• 3.5

• 7.0

• 14.0

• 20.0