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.

   Esme measured standing long jumps for the track club and the dance club, in inches. The dancers landed with style. How much greater is the median for the track club than for the dance club?

   4
2. 2.

   Kira asked riders in two bike clubs how many miles they biked this week. The trail club came back muddy. How much greater is the median for the trail club than for the city club?

   4
3. 3.

   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
4. 4.

   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
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.

   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.

   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 window seedlings tend to grow taller, because the median for the window seedlings is greater.
   • 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.
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?

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