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.

   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
6. 6.

   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
7. 7.

   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
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?

   • 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.
   • Every window seedling grew taller than every hallway seedling.
9. 9.

   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 two groups are about the same, because both plots have seven dots.
   • 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.
10. 10.

    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 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.
    • Every diamond kite stayed up longer than every box kite.
    • The two groups are about the same, because both plots have seven dots.