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The box plot at right shows the different grades (in percents) that students in Ms. Sanchez’s class earned on a recent test.  

  1. What was the median score on the test? What were the highest and lowest scores?

    Do you remember how to read a box plot?

    The given box plot has the following labels:  Left end of the left whisker is Lowest. The vertical line in box is Median. The right end of the right whisker is highest.

  1. Did most students earn a particular score? How do you know?

    Can this be determined from a box plot?

  1. If Ms. Sanchez has students in her class, about how many students earned a grade of or higher? About how many earned more than ? Explain how you know.

    Since is the median, half of the class earned  or higher and half earned lower than .

    students earned or higher, students earned or higher

  1. Can you tell if the scores between and were closer to or closer to 90%? Explain.

    Can this be determined from a box plot?

Box Plot: x axis, scaled in fives, from 60 to 100. Left whisker: 55 to 74. Box: 74 to 90, vertical line at 80. Right whisker: 90 to 100.