Empirical Rule

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

• 99.7

• 34

• 68

• 95

Tags

CCSS.HSS.ID.A.4

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

• 99.7

• 34

• 68

• 95

Tags

CCSS.HSS.ID.A.4

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

• 99.7

• 34

• 68

• 95

Tags

CCSS.HSS.ID.A.4

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

Tags

CCSS.HSS.ID.A.4

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

Tags

CCSS.HSS.ID.A.4

In a population, if μ=125 and σ=25, how common are values in the 100 – 175 range?

• 68%
• 84%
• 81.5%
• 95%

Tags

CCSS.HSS.ID.A.4

At a local high school, GPA's are normally distributed with a mean of 2.9 and standard deviation of 0.6. What is the GPA of the highest 2.5% of the students?

• 4.1 
• 4.1 or higher
• 4.7
• 4.5 or higher

Tags

CCSS.HSS.ID.A.4

The shelf life of a particular dairy product is normally distributed with a mean of 12 days and a standard deviation of 3 days.

About what percent of the products last between 12 and 15 days?

• 68%
• 34%
• 16%
• 2.5%

Tags

CCSS.HSF-LE.A.1B

In a population, if μ=125 (mean) and σ=25 (SD), how common are values in the 100 – 175 range?

• 68%

• 84%

• 81.5%

• 95%

Tags

CCSS.HSS.ID.A.4

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

Tags

CCSS.HSS.ID.A.4