Compare two groups using the mean or median

Answer Key - Grade 7 Math Worksheet

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

1. 1.

   Jun ran a one-minute typing test for two clubs. The keyboards clicked like popcorn. How much greater is the median for the keyboard club than for the art club?

   5
2. 2.

   Luz grew tomato plants in compost soil and in plain soil, then counted the tomatoes. The worms loved the compost. How much greater is the mean for the compost plants than for the plain-soil plants?

   4
3. 3.

   For science, Milo timed ice cubes melting in foam cups and metal cups. Nobody ate the evidence. How much greater is the mean for the foam cups than for the metal cups?

   9
4. 4.

   Two classes took the same 25-word spelling quiz, and Noah plotted the scores. The word "rhythm" caused some sighs. How much greater is the mean for the first class than for the second class?

   3.5
5. 5.

   Pia counted birds at a seed feeder and a fruit feeder each morning for a week. One bird looked proud. How much greater is the mean for the seed feeder than for the fruit feeder?

   4
6. 6.

   Tala asked two violin groups how many minutes they practiced on Saturday. The beginners' violins squeaked bravely. How much greater is the range for the beginner group than for the advanced group?

   14
7. 7.

   Zee counted the pages each student read during reading time in two classes. Someone read so fast the pages fluttered. How much greater is the range for the first class than for the second class?

   10
8. 8.

   Players at two basketball camps each took 80 free throws, and Bo plotted the shots made. One Elm camp player could not miss. Which sentence do the dot plots support?

   • The Elm camp players tend to make more shots, because the right-most dot belongs to the Elm camp players.
   • The two groups are about the same, because both plots have seven dots.
   • The Oak camp players tend to make more shots, because the median for the Oak camp players is greater.
   • Every Oak camp player made more shots than every Elm camp player.
9. 9.

   Esme's class flew diamond kites and box kites and timed how many minutes each stayed up. One box kite found a perfect gust. Which sentence do the dot plots support?

   • Every diamond kite stayed up longer than every box kite.
   • The box kites tend to stay up longer, because the right-most dot belongs to the box kites.
   • The diamond kites tend to stay up longer, because the median for the diamond kites is greater.
   • The two groups are about the same, because both plots have seven dots.
10. 10.

    Jun asked the Owl and Fox reading clubs how many books each member read over the summer. One Fox reader read in every spare minute. Which sentence do the dot plots support?

    • The two groups are about the same, because both plots have seven dots.
    • The Owl readers tend to read more books, because the median for the Owl readers is greater.
    • Every Owl reader read more books than every Fox reader.
    • The Fox readers tend to read more books, because the right-most dot belongs to the Fox readers.