Standard Deviation Mean

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

Find the mean:

2, 4, 6, 8, 10, 12

• 42

• 7

• 10

• 6

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

• 4.1

• 6

• 4.5

• 4

Find the standard deviation of the following

2, 5, 5, 8, 11, 12

to 3 s.f.

What is the standard deviation for the data given:
5, 10, 7, 12, 0, 20, 15, 22, 8, 2

• 6.89

• 10.1

• 7.26

• 9

Find the mean of the given data 8, 7, 5, 9, 6, 13

• 8

• 7.5

• 7.5

• 10

Find the mean of the given data 21.5 cm, 63.7 cm, 18.9 cm, 34.1 cm, 75.6 cm

• 44 cm

• 43 cm

• 42.76 cm

• 42.76

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 mean of 3, 7, 9, 9 12.

• 5

• 6

• 8

• 4

Find the mean of the following numbers 40, 38, 46, 38, 51 and 57.

• 45

• 40

• 38

• 35