Last updated: October 22, 2026 · Written by the Math Made Easy math teachers
Looking for an one variable statistics quiz? Then this Algebra 1 quiz on Center, Spread and Data Displays Compared asks 10 multiple-choice questions with instant feedback. This quiz has 10 multiple-choice questions on data displays, center and spread. Each question has one correct option and three distractors built from common mistakes. Read each explanation after answering.
Standards: S-ID.A.1, S-ID.A.2, S-ID.A.3 · Level: Grade 9 Algebra 1
What this Center, Spread and Data Displays Compared quiz checks
- Five-number summary: minimum, Q1, median, Q3, maximum.
- IQR = Q3 − Q1, and an outlier lies more than 1.5 × IQR beyond a quartile.
- A larger standard deviation means the values are more spread out.
- Outliers change the mean far more than the median.
- Compare distributions by center, spread, shape and outliers, in context.
The 10 questions of the quiz
- Which number is the median of the list 17, 5, 23, 11, 8?
- What is the mean of 5, 9, 12, 14?
- If Q1 = 18 and Q3 = 31, what is the IQR?
- Which measure is least affected by one extreme outlier?
- A data set has a larger standard deviation than another set. What does that mean?
- The dot plot shows 9 values, with dots at 2, 3, 3, 4, 4, 4, 5, 5 and 6.Which describes the shape?
- The histogram has a long tail on the right.Which statement is likely true?
- For a data set Q1 = 10 and Q3 = 16. Which value is an outlier by the 1.5 × IQR rule?
- Two classes have the same median test score. Class A has IQR 4 and class B has IQR 12. Which statement is correct?
- A set of 8 values has a mean of 15. What is the sum of the values?
After the quiz
Missed a question? Reread the Center, Spread and Data Displays Compared lesson, then take the quiz again. Next, solve the Algebra 1 worksheet on Center, Spread and Data Displays Compared, one star first, then two and three stars. Finally, take the chapter test under real conditions, without notes and with a timer.
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