The class 0 < t ≤ 20 has a frequency of 14. Work out the frequency density.
0.7The classes 20 < m ≤ 30 and 30 < m ≤ 60 both have a frequency of 15. Which bar is taller?
20 < m ≤ 30The class 1.5 < h ≤ 2 has a frequency of 7. Work out the frequency density.
14
A rectangle has an area of 24 squares.
What could its width and its height be?
1 and 24, 2 and 12, 3 and 8, 4 and 6, 1.5 and 16, …
frequency
= frequency density × class widthfrequency = area of the bar
Estimate how many values are between 15 and 30.
(a) frequency for 10 < t ≤ 15 15
(b) estimate between 5 and 15 20
| Class | Class width | Frequency density | Frequency |
|---|
| 10 < t ≤ 15 | 5 | 3 | 15 |
| 5 < t ≤ 10 | 5 | 1 | 5 |
(a) frequency for 155 < h ≤ 175 20
(b) estimate between 150 and 165 25
| Class | Class width | Frequency density | Frequency |
|---|
| 155 < h ≤ 175 | 20 | 1 | 20 |
| 150 < h ≤ 155 | 5 | 3 | 15 |
| 155 < h ≤ 165 | 10 | 1 | 10 |
(a) frequency for 10 < t ≤ 15 15
(b) estimate between 5 and 15 20
| Class | Class width | Frequency density | Frequency |
|---|
| 10 < t ≤ 15 | 5 | 3 | 15 |
| 5 < t ≤ 10 | 5 | 1 | 5 |
(a) frequency for 30 < m ≤ 40 15
(b) estimate between 10 and 30 25
| Class | Class width | Frequency density | Frequency |
|---|
| 30 < m ≤ 40 | 10 | 1.5 | 15 |
| 10 < m ≤ 20 | 10 | 0.5 | 5 |
| 20 < m ≤ 30 | 10 | 2 | 20 |
The bar for 10 < x ≤ 30 has a frequency of 40. The bar for 30 < x ≤ 35 is the same height. What is its frequency?
10The bar for 0 < t ≤ 20 has a frequency density of 1.5. Estimate how many values are less than 8. What have you assumed?
12. The values are spread evenly
Find the frequency for 10 < t ≤ 25.
24Estimate how many values are between 20 and 30 minutes.
22What have you assumed in question 2?
The values are spread evenly in each class
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