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.

   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
2. 2.

   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
3. 3.

   Kira sorts minutes of reading for students into a stem-and-leaf plot (the bookmarks stood guard). What is the largest value?

   49
4. 4.

   Milo sorts minutes on the bus for riders into a stem-and-leaf plot (the bus hummed). What is the largest value?

   66
5. 5.

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

   37
6. 6.

   Pia sorts quiz points for students into a stem-and-leaf plot (the quiz fit on one page). How many students scored 30 points or more?

   9
7. 7.

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

   • 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.
   • A bar graph, because each bar stands for one kind, not a number.
8. 8.

   Ari has 10 quiz scores and wants to see every score and which ones are close together. Which graph fits?

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