SAT Math Multiple Choice Question 847: Answer and Explanation

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Test Information

Question: 847

7.

Nine data points were used to generate the scatterplot shown. Assuming all whole numbervalues for the data points, which list correctly gives the domain of the data?

  • A. {10, 35, 55, 70, 80, 85}
  • B. {100, 200, 300, 400, 500}
  • C. {0, 50, 100, 150, 200, 250, 300, 350, 400}
  • D. {0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100}

Correct Answer: C

Explanation:

C

Difficulty: Easy

Category: Problem Solving and Data Analysis / Scatterplots

Strategic Advice: The domain of a set of data points is the set of inputs, which corresponds to the x-values of the data points when plotted on a graph. The set of values that make up the range corresponds to the y-values. To remember this, think alphabetically: x-axis before y-axis, domain before range, so domain corresponds to x-values on a graph.

Getting to the Answer: You don't need to write each point to find the domain. Just take note of where along the x-axis each of the points is plotted-there is a point on each grid-line between 0 and 400, and the grid-lines increase by 50, so the domain is {0, 50, 100, 150, 200, 250, 300, 350, 400}, which is (C).

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