Standard Deviation and Percents

What is the percentage of data that falls within two standard deviations of the mean?

• 68%

• 99.7%

• 95%

• 98%

What is the percentage of data that falls within one standard deviation of the mean?

• 67%

• 65%

• 72%

• 68%

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%

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

• 2.35

• 34

• 68

• 2.5

What percentage of data is within 2 standard deviations

• 68

• 95

• 99.7

• 2.35

This data is normally distributed. What percent of the data is in the shaded regions?

• 5%

• 95%

• 2.5%

• 50%

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

• .15

• 34

• 68

• 2.35

This data is normally distributed. What percent of the data is in the shaded region?

• 68%

• 32%

• 16%

• 50%

This data is normally distributed. Approximately, what percent of the data is in the shaded region?

• 68%

• 32%

• 16%

• 50%

Given that the total area shaded is 0.05, what is the positive z score associated with the drawing? Round to 2 decimals.