Mean and Standard Deviation

Given a variance of 64, what is the standard deviation?

• 8

• 4096

• 0

• 6.8

If test scores for a class are: 100, 100, 90, 90, 80, 80, 70, 70, 60, and 60, what are the mean and sample standard deviation?

• mean = 80, stdev = 14.9

• mean = 70, stdev = 14.9

• mean = 80, stdev = 13.9

• mean = 80, stdev = 12.9

• mean = 85, stdev = 14.9

What is the sample standard deviation for the data given:

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

• 6.89

• 10.1

• 7.26

• 9

Which set of data probably has the points closest to the mean?

• 1

• 2

• 3

• 4

A study of all the students at a small college showed a mean age of 20.7 and a standard deviation of 2.5 years.

Label both numbers with their appropriate symbol.

​ (a)   = 20.7 and ​ (b)   = 2.5

• 𝜇

• 𝜎

What is the standard deviation on the graph given?

35 is

• mean

• variance

• standard deviation

• range

Which data set has the largest standard deviation?

• Set 1

• Set 2

• Set 3

• Set 4

What is the sample standard deviation for the data given:

{12, 13, 29, 18, 61, 35, 21}

• 293.67

• 15.87

• 17.14

• 41.98

Find the mean of these numbers:
5,11,2,12,4,2

• 4.1

• 6

• 4.5

• 4