Graphs and Standard Deviations

What is the standard deviation on the graph given?

On the math portion of the SAT, scores are roughly normal, with a mean of 500 and a standard deviation of 100. What percent of scores are above 400?

• 68%

• 81.5%

• 84%

• 99.7%

According to the empirical rule, what percentage of data falls within 1 standard deviation? 

• 25%

• 68%

• 95%

• 99.7%

The center of the curve represents what value of a data set?

• μ = population mean

• δ = population standard deviation

• Σ= sum of the data values

• Ζ = z or standard scores

What is Standard Deviation?

• A measure of central tendency

• A measurement of how much data varies

• A measurement of how much data varies from the average

What's the standard deviation?

• 150

• 60

• 240

• 30

Which graph shows data that is normally distributed?

• 
• 
• 
• 

What percentage of the data is between 0 and -1 standard deviations

• 34%

• 50%

• 2.35%

• 13.5%

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

• 5%

• 95%

• 2.5%

• 50%

What percentage of the data is between 1 and 2 standard deviations

• 34%

• 50%

• 2.35%

• 13.5%