9709 S1 · Notes & worked examples
Check a final answer, then explain the reasoning on paper. Guest progress stays in this browser; an account saves future checks without overwriting your first result.
Recall
Maths4U Original · Short practice
The complete data set, measured in minutes, is \(16,17,17,18,19,20,20,21,23\). Treat these nine observations as a population.
| Stem | Leaf |
|---|---|
| 1 | 6 7 7 8 9 |
| 2 | 0 0 1 3 |
Key: 2 | 7 represents 27 minutes.
Find the mean in minutes.
Enter one number or fraction. Use at least six decimal places when needed; a distribution calculator may be used for probabilities.
Fresh review variant
Maths4U Original · Short practice
The complete data set, measured in minutes, is \(17,19,19,21,23,25,25,27,31\). Treat these nine observations as a population.
| Stem | Leaf |
|---|---|
| 1 | 7 9 9 |
| 2 | 1 3 5 5 7 |
| 3 | 1 |
Key: 2 | 7 represents 27 minutes.
Find the mean in minutes.
Enter one number or fraction. Use at least six decimal places when needed; a distribution calculator may be used for probabilities.
Method
Maths4U Original · Short practice
The complete data set, measured in minutes, is \(17,19,19,21,23,25,25,27,31\). Treat these nine observations as a population.
| Stem | Leaf |
|---|---|
| 1 | 7 9 9 |
| 2 | 1 3 5 5 7 |
| 3 | 1 |
Key: 2 | 7 represents 27 minutes.
Find the population variance in square minutes.
Enter one number or fraction. Use at least six decimal places when needed; a distribution calculator may be used for probabilities.
Fresh review variant
Maths4U Original · Short practice
The complete data set, measured in minutes, is \(18,21,21,24,27,30,30,33,39\). Treat these nine observations as a population.
| Stem | Leaf |
|---|---|
| 1 | 8 |
| 2 | 1 1 4 7 |
| 3 | 0 0 3 9 |
Key: 2 | 7 represents 27 minutes.
Find the population variance in square minutes.
Enter one number or fraction. Use at least six decimal places when needed; a distribution calculator may be used for probabilities.
Apply
Maths4U Original · Short practice
The complete data set, measured in minutes, is \(18,21,21,24,27,30,30,33,39\). Treat these nine observations as a population.
| Stem | Leaf |
|---|---|
| 1 | 8 |
| 2 | 1 1 4 7 |
| 3 | 0 0 3 9 |
Key: 2 | 7 represents 27 minutes.
Find the median in minutes.
Enter one number or fraction. Use at least six decimal places when needed; a distribution calculator may be used for probabilities.
Fresh review variant
Maths4U Original · Short practice
The complete data set, measured in minutes, is \(19,23,23,27,31,35,35,39,47\). Treat these nine observations as a population.
| Stem | Leaf |
|---|---|
| 1 | 9 |
| 2 | 3 3 7 |
| 3 | 1 5 5 9 |
| 4 | 7 |
Key: 2 | 7 represents 27 minutes.
Find the median in minutes.
Enter one number or fraction. Use at least six decimal places when needed; a distribution calculator may be used for probabilities.
Check understanding
Maths4U Original · Short practice
The complete data set, measured in minutes, is \(19,23,23,27,31,35,35,39,47\). Treat these nine observations as a population.
| Stem | Leaf |
|---|---|
| 1 | 9 |
| 2 | 3 3 7 |
| 3 | 1 5 5 9 |
| 4 | 7 |
Key: 2 | 7 represents 27 minutes.
Find the range in minutes.
Enter one number or fraction. Use at least six decimal places when needed; a distribution calculator may be used for probabilities.
Fresh review variant
Maths4U Original · Short practice
The complete data set, measured in minutes, is \(20,21,21,22,23,24,24,25,27\). Treat these nine observations as a population.
| Stem | Leaf |
|---|---|
| 2 | 0 1 1 2 3 4 4 5 7 |
Key: 2 | 7 represents 27 minutes.
Find the range in minutes.
Enter one number or fraction. Use at least six decimal places when needed; a distribution calculator may be used for probabilities.