Histograms, and which graph fits the data

Answer Key - Grade 7 Math Worksheet

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

1. 1.

   Noah draws the histogram of minutes of reading (the book club met). Now the bars are made 10 wide. How tall is the new bar from 0 up to 10?

   13
2. 2.

   Pia draws the histogram of plant heights in centimeters (the plants grew). Now the bars are made 4 wide. How tall is the new bar from 14 up to 18?

   26
3. 3.

   Ren draws the histogram of points scored in a season (the scoreboard flickered). Now the bars are made 30 wide. How tall is the new bar from 50 up to 80?

   21
4. 4.

   Tala draws the histogram of miles biked in a week (the bell rang). Now the bars are made 15 wide. How tall is the new bar from 5 up to 20?

   36
5. 5.

   Zee sorts minutes of piano practice for students into a stem-and-leaf plot (the piano stayed in tune). What is the median?

   29
6. 6.

   Ari sorts minutes of reading in a night for students into a stem-and-leaf plot (the lamp stayed on). What is the median?

   44
7. 7.

   Jun has 24 heights in inches and wants to keep every value but group them by tens. Which graph fits?

   • A histogram, because it groups the values into bars.
   • A box plot, because it shows the median and the spread of the heights, grouped by tens
   • A bar graph, because it uses bars to show counts.
   • A stem-and-leaf plot, because it keeps every value and groups them by tens.
8. 8.

   Kira has 70 sleep times and wants to see whether most are bunched up or spread evenly. Which graph fits?

   • A dot plot, because it shows every value, so the shape is easy to see
   • A bar graph, because it uses bars to show counts.
   • A box plot, because it shows the median and the spread.
   • A histogram, because it groups many values into bars to show the shape.
9. 9.

   Luz wants to know how many of 80 riders rode 5 to 10 miles, how many 10 to 15, and so on. Which graph fits?

   • 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 counts are easy to read
   • A box plot, because it shows the median and the spread.
10. 10.

    Milo measured how high 12 balloons floated and wants to see each height and which are close together. Which graph fits?

    • 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 heights
    • A histogram, because it groups the values into bars.
    • A bar graph, because it uses bars to show counts.