Empirical Rule Statistics

According to the Empirical Rule, what percentage of data values lie within ONE standard deviation of the mean?

• 68%

• 95%

• 99.7%

• 100%

According to the Empirical Rule, what percentage of data values lie within TWO standard deviation of the mean?

• 68%

• 95%

• 99.7%

• 100%

According to the Empirical Rule, what percentage of data values lie within THREE standard deviation of the mean?

• 68%

• 95%

• 99.7%

• 100%

The ____________ is equal to the standard deviation squared.

• standard deviation

• range

• variance

• maximum value

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

• 68%

• 95%

• 99.7%

• 50%

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.

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

• 68%

• 95%

• 99.7%

• 50%

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

• 68%

• 95%

• 99.7%

• 50%

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

• 68%

• 95%

• 99.7%

• 50%

Scores on a certain standardized test have a mean of 500, and a standard deviation of 100. How common is a score between 600 and 700? Calculate the probability. 

• 2.5%

• 2.35%

• 16%

• 13.5%