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.

   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
5. 5.

   On a class trip, Ren counted the shells each student collected at two beaches. A crab kept watch. How much greater is the range for the north beach than for the south beach?

   9
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.

   Ari grew seedlings by a sunny window and in a dim hallway, then measured them in centimeters. One hallway seedling reached for the ceiling lights. Which sentence do the dot plots support?

   • Every window seedling grew taller than every hallway seedling.
   • The hallway seedlings tend to grow taller, because the right-most dot belongs to the hallway seedlings.
   • The two groups are about the same, because both plots have seven dots.
   • The window seedlings tend to grow taller, because the median for the window seedlings is greater.
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 Oak camp players tend to make more shots, because the median for the Oak camp players is greater.
   • The Elm camp players tend to make more shots, because the right-most dot belongs to the Elm camp players.
   • Every Oak camp player made more shots than every Elm camp player.
   • The two groups are about the same, because both plots have seven dots.
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 two groups are about the same, because both plots have seven dots.
   • The diamond kites tend to stay up longer, because the median for the diamond kites is greater.
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 Fox readers tend to read more books, because the right-most dot belongs to the Fox readers.
    • The Owl readers tend to read more books, because the median for the Owl readers is greater.
    • The two groups are about the same, because both plots have seven dots.
    • Every Owl reader read more books than every Fox reader.