Year 8 Statistics pretest Chapter 9

A big jar contains 3000 jelly beans. The jelly beans are blue, red and yellow. A sample of 45 jelly beans is taken, and it is found to contain 27 blue jelly beans. Estimate the number of blue jelly beans in the jar.

• 1200

• 1500

• 1800

• 2000

• 2200

Calculate the mean of this data set. Give your answer correct to two decimal places

3, 3, 4, 5, 7, 8, 8, 12

Calculate the median of this data set.

3, 3, 4, 5, 7, 8, 8, 12

Calculate the median of this data set:

11, 12, 14, 14, 16, 17, 20, 25, 26

Calculate the mode of this data set:

11, 12, 14, 14, 16, 17, 20, 25, 26

The frequency table shows the number of children per household.

State how many households were included in the data.

The frequency table shows the number of children per household.

State the number of households with more than one child.

The frequency table shows the number of children per household.

Calculate the median.

The frequency table shows the number of children per household.

Calculate the mean.

The frequency table shows the number of children per household.

State the range.