Calculate Variance and Standard Deviation

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

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

Which of the following is a measure of variability?

• mean

• median

• mode

• standard deviation

Which data set has the largest standard deviation?

• Set 1

• Set 2

• Set 3

• Set 4

Last step... What is the variance?

• 24.25

• 29.1

• 2

• 4.9

On four tests, Jean got the following scores: 100, 79, 86, and 91. What is the variance for this distribution?

• 89

• 15.3

• 58.5

• 234

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

Procedure for finding the (a)   : find the mean, subtract the mean from every observation in the dataset, square each of those differences, add them all up and then divide by the count of observations minus 1. But do not take the square root.

Once you've calculated the mean, and listed the values in a table, what is the next step to calculating the variance?

• Square each value in the data set

• Subtract each value in the data set from the mean

• Subtract the mean from each value in the data set

• Add the mean to each value in the data set

Once you've calculated the mean, and listed the values in a table, what is the next step to calculating the variance? #27

• Square each value in the data set

• Subtract each value in the data set from the mean

• Subtract the mean from each value in the data set

• Add the mean to each value in the data set