BUILD FLUENCY. EARN YOUR ASCENT.Sign in Year 9
Compare distributions and choose a measure
Free examples and worked answers. No account needed.
Practise the method.
Compare distributions and choose a measure
Compare distributions and choose a measure
Example 1
What is Group B’s mean minus Group A’s mean? Give an exact fraction or decimal.
Show worked answer
Answer: 7214
- Group A total =93 and Group B total =307.
- Each has 7 scores
- the difference of means is 7307−93=7214(about 30.57142857).
Example 2
What is Group B’s median minus Group A’s median?
Show worked answer
Answer: 22
- The fourth value is the median of each ordered set: A=12,B=34.
- Difference =34−12=22.
Example 3
How do the ranges of these groups compare?
Show worked answer
Answer: They are equal
- A ranges from 6 to 21, giving 15.
- B ranges from 8 to 23, giving 15.
- Adding a constant does not change spread;
- multiplying every value scales it.
Put it into practice.
Sign in to choose a set, get feedback and keep your progress.