Empirical Rule

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

• .26
• .15
• .30
• .17

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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

The mean life of a tire is 30,000 km. The standard deviation is 2000 km.

Then, 68% of all tires will have a life between ___________ km and __________ km.

•  28,000 km and 32,000 km.
• 24,000 km and 34,000 km.
• 26,000 km and 34,000 km.
• 27,000 km and 31,000 km.

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CCSS.HSS.ID.A.4

According to the empirical rule, what percentage of data falls within 1 standard deviation? 

• 25%
• 68%
• 95%
• 99.7%

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CCSS.HSS.ID.A.4

According to the empirical rule, how much of the data falls within 3 standard deviations? 

• 25%
• 68%
• 95%
• 99.7%

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CCSS.HSS.ID.A.4

What percent of people are 3 standard deviations above the mean?

• .15

• 34

• 68

• 2.35

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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

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 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 3 standard deviations of the mean?

• 99.7

• 34

• 68

• 95

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CCSS.HSS.ID.A.4