Lesson 2.3 Empirical Rule 68-95-99.7 Practice

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

• 99.7

• 34

• 68

• 95

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CCSS.HSS.ID.A.4

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

• 99.7

• 34

• 68

• 95

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CCSS.HSS.ID.A.4

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

• 99.7

• 34

• 68

• 95

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CCSS.HSS.ID.A.4

What percent of people are 2 standard deviations or more above the mean?

• 2.35

• 34

• 68

• 2.5

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CCSS.HSS.ID.A.4

In the diagram, about 68% of the scores fall within the shaded area, which is symmetric about the mean. The distribution is normal and scores in the area range from 50 to 80. What is the standard deviation of the scores in this distribution?

• 7.5

• 15

• 30

• 65

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CCSS.HSS.ID.A.4

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.

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CCSS.HSS.ID.A.4

CCSS.HSS.MD.A.1

What is the percentage of the area OUTSIDE of 80-120

• 95%

• 5%

• .03%

• 99.7%

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CCSS.HSS.ID.A.4

What is the percentage of the area OUTSIDE of 90-110

• 32%

• 50%

• 75%

• 68%

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CCSS.HSS.ID.A.4

What percentage is between 80 and 100

• 47.5%

• 55%

• 80%

• 62.9%

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CCSS.HSS.ID.A.4

What is the percentage of the scores from 90-100

• 68%

• 95%

• 34%

• 99.7

Tags

CCSS.HSS.ID.A.4