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Ten students compared the amount (in dollars) they spent on books each week. The box plot shows the results. The median amount they spent each week is ____ ($20,$30,$40,$50) . The difference of the first and third quartiles of the data set is ____ ($15,$30,$45,$60).

Ten students compared the amount (in dollars) they spent on books each week. The box-example-1

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The median is 50.
The first quartile is 20, the third is 65, the difference is 45.
User Tianshu Wang
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The box plot contains a box and 5 points:

  1. 1st point is the left endpoint (the smallest number);
  2. 5th point is the right endpoint (the greatest number);
  3. 2nd point is
    Q_1 - first quartile;
  4. 3rd point is
    Q_2 - second quartile = median;
  5. 4th point is
    Q_3 - third quartile.

Then the median is $50, and
Q_3-Q_1=\$65-\$20=\$45.

Answer: $50; $45.

User Creabine
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7.6k points

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