The Empirical Rule

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%

At a local high school, GPA's are normally distributed with a mean of 2.9 and standard deviation of 0.6. What percentage of students at the high school have a GPA between 2.3 and 3.5?

• 68%
• 99.7%
• 95%
• 84%

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

Where can we locate the mean in the normal curve?

• to the left portion

• to the right portion

• at the center

• on the z - axis

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

• 25%
• 68%
• 95%
• 99.7%

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

• 9 to 21
• 12 to 18
• 6 to 24
• 13 to 16

Given: Mean = 10, standard deviation = 2.
What is the probability that the data will be between 4 and 16? 

• 68%
• 98%
• 99.7%
• 95%

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

• 99.7

• 34

• 68

• 95