Free SAT One-variable data: distributions and measures practice questionsdigital SAT, 2026 format
Mean, median, and spread of one data set, often read from a histogram, bar graph, or frequency table rather than a plain list of numbers.
Answer each question, then read why the right answer is right and why the tempting one is wrong.
Question 1
In a science class, the 12 students in Group A had a mean quiz score of 88, and the students in Group B had a mean quiz score of 80. If the mean score for the two groups combined was 86, how many students are in Group B?
Question 2
The dot plots below summarize the number of books read last summer by students in two classes of 20 students each. Class A: most values clustered between 3 and 6, with two students at 14 and 15. Class B: values spread fairly evenly from 2 to 9. Which statement about the two classes is true?
Question 3
Data set A consists of the values 3, 5, 7, 9, and 11. Data set B is created by adding 4 to each value in data set A. Which statement correctly compares the two data sets?
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