Algebra 2 Empirical Rule

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

• 99.7

• 34

• 68

• 95

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

• 99.7

• 34

• 68

• 95

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

• 99.7

• 34

• 68

• 95

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True or false: A normal curve is symmetric

• True
• False

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

• 100

• 50

• .5

• 1

The Empirical Rule's percents are:

• 68-95.7-99

• 68-95-99.7

• 68.7-95-99

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

• 13

• .15

• 157

• .3

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

• .15

• 34

• 68

• 2.35

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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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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

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