8 A garden centre stocks coniferous hedging plants. These are displayed in 10 rows, each of 120 plants. An employee collects a sample of the heights of these plants by recording the height of each plant on the front row of the display.
- Explain whether the data collected by the employee is a simple random sample.
The data are shown in the cumulative frequency curve below.
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The owner states that at least \(75 \%\) of the plants are between 40 cm and 80 cm tall. - Show that the data collected by the employee supports this statement.
- Explain whether all samples of 120 plants would necessarily support the owner's statement.