What do the lines to the left and right of the black dot on the performance graph represent?

• A. The range of likely scores the student would receive if they took the test multiple times within the window.
• B. The average score of all students in the class.
• C. The maximum score possible on the test.
• D. The standard deviation of scores.

Answer: (A)

The lines next to the dot show how scores can vary around a single result, illustrating the range of scores you might get if you took the test several times within that window. The dot is one observed score, and the whiskers on either side represent the spread or variability around it.

So this is about a range of likely scores, not the class average, not the maximum possible score, and not a single value for spread like the standard deviation.