Question 1
Question detail
If the first quartile (Q1) is 10 and the third quartile (Q3) is 30, what is the inter-quartile range?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Statistical skills
Question
- A. 20
- B. 40
- C. 10
- D. 30
Answer
20
Explanation
The inter-quartile range is calculated as Q3 - Q1, which is 30 - 10 = 20.
Common mistake
Confusing Range and Inter-Quartile Range
Students often confuse the range with the inter-quartile range, thinking they are the same measure of spread.
Remember that the range is the difference between the highest and lowest values, while the inter-quartile range is the difference between the first and third quartiles, representing the middle 50% of the data.
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