Handling Data 6
2 marks · EasyThe grouped frequency table below shows the masses of apples in a box.
| Mass (g) | Frequency |
|---|---|
| 60 < m ≤ 80 | 6 |
| 80 < m ≤ 100 | 18 |
| 100 < m ≤ 120 | 12 |
Calculate the frequency density for the 80 < m ≤ 100 class.
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0.9 (±0.01)
Also accept: 0.9
Common mistakes: 9; 0.45
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Marking points
M1 · 1 mark · Uses correct method: frequency density = frequency ÷ class width.
A1 · 1 mark · Correctly calculates frequency density as 0.9.
Worked solution
Class width = 100 - 80 = 20
Frequency density = frequency ÷ class width = 18 ÷ 20 = 0.9