Comparing different data representations: check 1
Difficulty: ★★☆Info
Maths4U Original · Short practice
The complete data set, measured in minutes, is \(13,15,15,17,19,21,21,23,27\). Treat these nine observations as a population.
| Stem | Leaf |
|---|---|
| 1 | 3 5 5 7 9 |
| 2 | 1 1 3 7 |
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.
Comparing different data representations: review variant 1
Difficulty: ★★☆Info
Maths4U Original · Short practice
The complete data set, measured in minutes, is \(14,17,17,20,23,26,26,29,35\). Treat these nine observations as a population.
| Stem | Leaf |
|---|---|
| 1 | 4 7 7 |
| 2 | 0 3 6 6 9 |
| 3 | 5 |
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.
Comparing different data representations: check 2
Difficulty: ★★☆Info
Maths4U Original · Short practice
The complete data set, measured in minutes, is \(14,17,17,20,23,26,26,29,35\). Treat these nine observations as a population.
| Stem | Leaf |
|---|---|
| 1 | 4 7 7 |
| 2 | 0 3 6 6 9 |
| 3 | 5 |
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.
Comparing different data representations: review variant 2
Difficulty: ★★☆Info
Maths4U Original · Short practice
The complete data set, measured in minutes, is \(15,19,19,23,27,31,31,35,43\). Treat these nine observations as a population.
| Stem | Leaf |
|---|---|
| 1 | 5 9 9 |
| 2 | 3 7 |
| 3 | 1 1 5 |
| 4 | 3 |
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.
Comparing different data representations: check 3
Difficulty: ★★☆Info
Maths4U Original · Short practice
Measurements of duration t, in seconds, are grouped below.
| Class (seconds) | Frequency |
|---|---|
| \(0\le t<5\) | 16 |
| \(5\le t<15\) | 29 |
| \(15\le t<30\) | 42 |
Estimate the variance in square seconds.
Enter one number or fraction. Use at least six decimal places when needed; a distribution calculator may be used for probabilities.
Comparing different data representations: review variant 3
Difficulty: ★★☆Info
Maths4U Original · Short practice
Measurements of duration t, in seconds, are grouped below.
| Class (seconds) | Frequency |
|---|---|
| \(0\le t<2\) | 17 |
| \(2\le t<6\) | 31 |
| \(6\le t<12\) | 45 |
Estimate the variance in square seconds.
Enter one number or fraction. Use at least six decimal places when needed; a distribution calculator may be used for probabilities.
Comparing different data representations: check 4
Difficulty: ★★☆Info
Maths4U Original · Short practice
The ordered values are \(15,16,17,17,18,19,20,21,22,23,24,25,26,27,28,30,35\). Exclude the overall median when forming the two halves, and take the median of each half as its quartile.
Find the upper 1.5 IQR fence.
Enter one number or fraction. Use at least six decimal places when needed; a distribution calculator may be used for probabilities.
Comparing different data representations: review variant 4
Difficulty: ★★☆Info
Maths4U Original · Short practice
The ordered values are \(16,18,20,20,22,24,26,28,30,32,34,36,38,40,42,46,56\). Exclude the overall median when forming the two halves, and take the median of each half as its quartile.
Find the upper 1.5 IQR fence.
Enter one number or fraction. Use at least six decimal places when needed; a distribution calculator may be used for probabilities.