Standard Deviation & Variance

Find the standard deviation of the following

2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2

Find the standard deviation of the following

7, 8, 10, 10, 11, 12, 13, 14, 14, 14

Round to the nearest hundredth.

What does this symbol represent?

• Standard Deviation
• Variance
• Mean Absolute Deviation
• Sigma

What does standard deviation represent?

• How many different variations are in the data set.

• How the population varies compared to the sample.

• How spread out each data value is from the mean.

• The range, but with a bunch of other stuff going on.

What is the variance for the data given:

5, 10, 7, 12, 0, 20, 15, 22, 8, 2

• 47.47

• 102.01

• 52.77

• 81

Calculate the standard deviation for the following data.

• 2.928

• 4.848

• 5.148

• 6.227

Ervin bowled 7 games last weekend. His scores are: 155, 165, 138, 172, 127, 193, 142. What is the sample standard deviation of Ervin's scores?

• 511.33

• 22.61

• 438.48

• 20.94

If the standard deviation of a data set is 4, what is the variance?

• 2
• 16
• 4