Histograms, and which graph fits the data

Answer Key - Grade 7 Math Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1. 1.

   Ari makes a histogram of minutes of homework from 10 to 50, with bars 10 wide (the pencil sharpened itself). How many bars does it have?

   4
2. 2.

   Bo makes a histogram of plant heights in centimeters from 10 to 40, with bars 5 wide (one plant leaned toward the window). How many bars does it have?

   6
3. 3.

   Esme makes a histogram of quiz scores from 20 to 80, with bars 20 wide (the quiz had a smiley face). How many bars does it have?

   3
4. 4.

   Jun makes a histogram of test scores from 30 to 100, with bars 10 wide (the test was friendly). How many bars does it have?

   7
5. 5.

   Luz sorts points in a game for players into a stem-and-leaf plot (the ball bounced twice). What is the smallest value?

   29
6. 6.

   Noah sorts minutes of bike riding for riders into a stem-and-leaf plot (the bell rang often). What is the smallest value?

   37
7. 7.

   Ren sorts minutes of piano practice for students into a stem-and-leaf plot (the metronome counted along). How many students practiced 30 minutes or more?

   7
8. 8.

   Zee asked 30 students for their favorite pet: dog, cat or fish. Which graph shows how many chose each pet?

   • A bar graph, because each bar stands for one kind, not a number.
   • A box plot, because it shows the median and the spread of the answers
   • A histogram, because it groups the values into bars.
   • A dot plot, because it shows every value on a number line.
9. 9.

   Bo timed the walk to school for 90 students and wants the shape of all 90 times. Which graph fits?

   • A box plot, because it shows the median and the spread.
   • A dot plot, because it shows every value, so the shape is easy to see
   • A histogram, because it groups many values into bars to show the shape.
   • A bar graph, because it uses bars to show counts.
10. 10.

    Esme measured 8 seedlings and wants to see each height on a number line. Which graph fits?

    • A box plot, because it shows the median and the spread.
    • A bar graph, because it uses bars to show counts.
    • A histogram, because it groups the values into bars.
    • A dot plot, because it shows every value on a number line.