Mean and Standard Deviation

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

• 45

• 40

• 38

• 35

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

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

• 2

• 16

• 4

Before you can begin calculating the variance, you must first:

• find the mean

• find the median

• find the mode

• find the range

How do you calculate the standard deviation?

• Divide the variance by 2.

• Its a long process and I can't explain it right now.

• Find the mean and multiply it by the variance.

• Take the square root of the variance.

What does this symbol represent?

• Standard Deviation

• Variance

• Mean Absolute Deviation

• Sigma

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