Standard Deviation Range Media Mode

If a number is added to a set that is far away from the mean, how does this affect standard deviation?

• increase

• decrease

• stay the same

If a number is added to the set that is near the mean, how does this affect standard deviation?

• increase

• decrease

• stay the same

Using the normal distribution curve drawn above, identify the requested information below. The percent falling between 1 standard deviation above and below the mean is ________________.

• 68%

• 95%

• 81.5%

• 99.7%

Using the normal distribution curve drawn above, identify the requested information below. The percent falling between 2 standard deviations above and below the mean is ________________.

• 68%

• 95%

• 81.5%

• 99.7%

What is the Range for 2 Standard Deviations away 95%

• 400-700

• 300-600

• 300-700

• 200-800

Which measure of variability should you use?

• IQR

• standard deviation

Which measure of variability should you use?

• IQR

• standard deviation

Find the range.

Using the normal distribution curve drawn above, identify the requested information below. The percent falling between 3 standard deviations above and below the mean is ________________.

• 68%

• 95%

• 81.5%

• 99.7%

A normal distribution has a mean of 80 and a standard deviation of 3. What percent of data points are between 74 and 80?

• 13.5%

• 47.5%

• 34%

• 68%