Year 8 Statistics Pre-Test Quiz

What is the mean of the following set of numbers: 5, 7, 9, 12, 15?

• 9.6

• 13

• 10

• 8.5

Calculate the median of the following set of numbers: 10, 15, 20, 25, 30

• 25

• 15

• 35

• 20

Find the mode of the following set of numbers: 3, 5, 5, 7, 9, 9, 9

• 7

• 5

• 9

• 3

Calculate the interquartile range for the following set of numbers: 12, 15, 18, 20, 22, 25, 30

• 5

• 50

• 10

• 8

What type of graph is best used to represent categorical data?

• Line graph

• Pie chart

• Bar graph

• Scatter plot

Which type of graph is suitable for showing the relationship between two continuous variables?

• Pie chart

• Bar graph

• Line graph

• Scatter plot

What is the measure of central tendency that is most affected by extreme values in the data set?

• mean

• median

• mode

• range

Analyze the following data set and identify the outlier: 10, 15, 20, 25, 30, 100

• 75

• 200

• 100

• 50

Based on the given data, calculate the range and the interquartile range: 5, 8, 10, 12, 15, 18, 20

• Range: 12, Interquartile Range: 8

• Range: 15, Interquartile Range: 10

• Range: 5, Interquartile Range: 18

• Range: 20, Interquartile Range: 5

Calculate the range for the following set of numbers: 5, 10, 15, 20, 25

• 15

• 20

• 25

• 30