Measures of central tendency

The arithmetic mean of 2, 4, 6, 8 and 10 is:

• 1 8
• 2 6
• 3 5
• 4 30

The median of 3, 5, 7, 9 and 11 is:

• 1 7
• 2 35
• 3 5
• 4 9

The median of 4, 6, 8 and 10 is:

• 1 7
• 2 28
• 3 8
• 4 6

The mode of 2, 3, 3, 4, 3, 5 is:

• 1 5
• 2 2
• 3 3
• 4 4

Which average is least affected by extreme values?

• 1 The sum
• 2 The weighted mean
• 3 The median
• 4 The mean

The formula for the mean of a frequency distribution is:

• 1 Σx × Σf
• 2 Σx ÷ Σf
• 3 Σf ÷ Σfx
• 4 Σfx ÷ Σf

A set of data with two modes is called:

• 1 Unimodal
• 2 Skewed
• 3 Bimodal
• 4 Symmetric

Which average can be used for non-numerical data such as favourite colours?

• 1 The mean
• 2 The mode
• 3 The weighted mean
• 4 The median

The mean of 10, 20 and 30 is:

• 1 60
• 2 20
• 3 30
• 4 10

The sum of 5 values is 40. Their mean is:

• 1 5
• 2 35
• 3 8
• 4 200

A weighted mean is used when:

• 1 There is only one value
• 2 The values have different importance
• 3 The data are not numbers
• 4 All values are equal

The mean of the frequency distribution with values 1, 2 and 3 and frequencies 2, 3 and 5 is:

• 1 2.3
• 2 2
• 3 1.5
• 4 3