Mad Variance and Standard Deviation

The number of miles that Jenna cycled each week for a 7-week period is shown:

36, 42, 28, 52, 48, 36, 31

What is the IQR number of miles Jenna cycled?

• 24

• 17

• 6

• 52

If the standard deviation of a data set is 10, what is the variance?

• 20

• 100

• 2.5

• 10

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

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

• 511.33

• 22.61

• 438.29

• 20.94

The number of goals scored by seven forwards in one soccer season were 8, 6, 4, 8, 3, 1, and 5. Find the mean absolute deviation (MAD) of goals scored by the seven forward.

• 2

• 10

• 3

• 5

What is the difference between the formulas for population variance and sample variance?

• The sample variance is the square root of the population variance.

• The population variance divides the sum of the squares by n-1, while sample divides by N.

• The population variance divides the sum of the squares by N, while sample divides by n-1.

• There is no difference.

The masses of six children are 34.5 kilograms, 42.6 kilograms, 39.8 kilograms, 40.1 kilograms, 53.4 kilograms, and 33.8 kilograms. Find the mean mass.

• 40.7 kg
• 40
• 41
• 50

Find the IQR of the given data 21.5 cm, 63.7 cm, 18.9 cm, 34.1 cm, 75.6 cm, 30.8cm.

• 44 cm

• 43 cm

• 42.2 cm

• 42.76

What is the sample standard deviation for the data given:

5, 10, 7, 12, 0, 20, 15, 22, 8, 2. Round the mean to whole number.

• 6.89

• 10.1

• 7.26

• 9

What is the population variance for the data given:

15, 10, 7, 12, 10, 20, 15, 22, 8, 2. Round the mean to whole number.

• 32.1

• 12.1

• 33.1

• 12