Question

use a calculator to compute the average heights of the plants in each group to the nearest centimeter. week 1 average height control group: \boxed{} cm exper. group: \boxed{} cm done control group experimental group

Explanation:

Step1: Determine heights of Control Group plants

Looking at the Control Group (plants 3,4,5,6 and the first one? Wait, the Control Group has plants: let's see the ruler. The first plant in Control Group (leftmost) seems to be at 8 cm? Wait, no, the Control Group has plants labeled 3,4,5,6 and maybe another? Wait, the Control Group's plants: let's count the number of plants. Wait, the Control Group (left tray) has 5 plants? Wait, no, the left tray (Control Group) has plants: the first one (leftmost) is at 8 cm? Wait, no, let's look again. Wait, the ruler is in cm, with marks at 5,10,15,... So the Control Group plants:

- Plant 1 (leftmost in Control): height ~8 cm? Wait, no, maybe I miscounted. Wait, the Control Group (left tray) has plants: let's see the positions. Wait, the Control Group has plants with labels 3,4,5,6? No, maybe the first tray (Control) has 5 plants? Wait, no, the image shows:

Control Group (left tray): plants at heights (from ruler):

- First plant (leftmost): ~8 cm?

- Second plant (label 3): ~10 cm?

- Third plant (label 4): ~12 cm?

- Fourth plant (label 5): ~14 cm?

- Fifth plant (label 6): ~10 cm? Wait, no, maybe I'm wrong. Wait, maybe the Control Group has 5 plants? Wait, no, the right tray (Experimental Group) has 6 plants (labels 1-6). Wait, the left tray (Control Group) has 5 plants? Wait, no, looking at the image:

Control Group (left tray): plants at heights:

Let's list the heights:

- Plant 1 (leftmost in Control): 8 cm

- Plant 2 (label 3): 10 cm

- Plant 3 (label 4): 12 cm

- Plant 4 (label 5): 14 cm

- Plant 5 (label 6): 10 cm

Wait, no, maybe the Control Group has 4 plants? Wait, the labels are 3,4,5,6. So 4 plants? Wait, no, the left tray has 5 plants? I think I made a mistake. Wait, let's check the Experimental Group (right tray) has 6 plants (labels 1-6), each at:

Experimental Group plants:

- Plant 1: 10 cm

- Plant 2: 12 cm

- Plant 3: 10 cm

- Plant 4: 12 cm

- Plant 5: 12 cm

- Plant 6: 10 cm

Wait, no, maybe the Control Group has 5 plants? Wait, I think I need to re-express. Wait, maybe the Control Group has 5 plants with heights: 8, 10, 12, 14, 10? No, that doesn't make sense. Wait, maybe the Control Group has 4 plants? Wait, the problem says "each group" – maybe the Control Group has 5 plants? Wait, no, let's look again.

Wait, maybe the Control Group has 5 plants with heights: 8, 10, 12, 14, 10? No, that's not right. Wait, maybe the Control Group has 5 plants: heights 8, 10, 12, 14, 10. Sum: 8+10+12+14+10 = 54. Average: 54/5 = 10.8 ≈ 11? No, that can't be. Wait, maybe the Control Group has 4 plants. Let's check the Experimental Group first.

Experimental Group (right tray, 6 plants):

- Plant 1: 10 cm

- Plant 2: 12 cm

- Plant 3: 10 cm

- Plant 4: 12 cm

- Plant 5: 12 cm

- Plant 6: 10 cm

Sum: 10 + 12 + 10 + 12 + 12 + 10 = 66. Average: 66/6 = 11 cm.

Now Control Group: let's see, the left tray (Control) has plants:

- Plant 1 (leftmost): 8 cm

- Plant 2 (label 3): 10 cm

- Plant 3 (label 4): 12 cm

- Plant 4 (label 5): 14 cm

- Wait, no, maybe the Control Group has 5 plants? Wait, the labels are 3,4,5,6 – maybe 4 plants. Wait, maybe I miscounted. Let's try again.

Wait, the Control Group (left tray) has plants at heights:

- First plant (leftmost): 8 cm

- Second plant (label 3): 10 cm

- Third plant (label 4): 12 cm

- Fourth plant (label 5): 14 cm

- Fifth plant (label 6): 10 cm

Wait, that's 5 plants. Sum: 8 + 10 + 12 + 14 + 10 = 54. Average: 54 / 5 = 10.8 ≈ 11 cm? But that doesn't match. Wait, maybe the Control Group has 4 plants: labels 3,4,5,6. So 4 plants. Heights:

- Label 3: 10 cm

- Label 4: 12 cm

- Label 5: 14 cm

- Label 6: 10 cm

Sum: 10 + 12 + 14 + 10 = 46. Average: 46 / 4 = 11.5 ≈ 12 cm? No, that's not right. Wait, maybe the first plant in Control Group (leftmost) is at 8 cm, and the other four are 10,12,14,10. So 5 plants: 8,10,12,14,10. Sum 54, average 10.8 ≈ 11.

Experimental Group (6 plants): heights 10,12,10,12,12,10. Sum: 10+12=22, +10=32, +12=44, +12=56, +10=66. 66/6=11.

Wait, maybe the Control Group has 5 plants with heights 8,10,12,14,10. Average: 54/5=10.8≈11.

Experimental Group: 6 plants, heights 10,12,10,12,12,10. Sum 66, average 11.

Wait, but maybe I made a mistake in the heights. Let's check the ruler again. The ruler has marks at 5,10,15,20,... So each major mark is 5 cm, with minor marks (1 cm each). So:

- The first plant in Control Group (leftmost) is at 8 cm (between 5 and 10, 3 cm above 5, so 8 cm).

- Second plant (label 3) is at 10 cm (at the 10 mark).

- Third plant (label 4) is at 12 cm (2 cm above 10).

- Fourth plant (label 5) is at 14 cm (4 cm above 10).

- Fifth plant (label 6) is at 10 cm (at 10 mark).

So Control Group heights: 8,10,12,14,10. Sum: 8+10=18, +12=30, +14=44, +10=54. Number of plants: 5. Average: 54/5=10.8≈11 cm (rounded to nearest cm).

Experimental Group (right tray, 6 plants):

- Plant 1 (label 1): 10 cm (at 10 mark).

- Plant 2 (label 2): 12 cm (2 cm above 10).

- Plant 3 (label 3): 10 cm (at 10 mark).

- Plant 4 (label 4): 12 cm (2 cm above 10).

- Plant 5 (label 5): 12 cm (2 cm above 10).

- Plant 6 (label 6): 10 cm (at 10 mark).

Heights: 10,12,10,12,12,10. Sum: 10+12=22, +10=32, +12=44, +12=56, +10=66. Number of plants: 6. Average: 66/6=11 cm.

Wait, but that would make both averages 11? That seems odd. Maybe I misread the heights. Let's try again.

Alternative approach: Maybe the Control Group has 4 plants (labels 3,4,5,6) with heights 10,12,14,10. Sum: 10+12+14+10=46. Average: 46/4=11.5≈12 cm.

Experimental Group: 6 plants, heights 10,12,10,12,12,10. Sum 66, average 11.

But the problem says "to the nearest centimeter".

Wait, maybe the Control Group has 5 plants with heights 8,10,12,14,10. Average 10.8≈11.

Experimental Group: 6 plants, average 11.

Alternatively, maybe the Control Group has 5 plants with heights 9,10,12,14,10. Sum 55, average 11.

Experimental Group: 6 plants, sum 66, average 11.

Alternatively, maybe I made a mistake in the number of plants. Let's check the image again. The left tray (Control Group) has 5 plants? The right tray (Experimental Group) has 6 plants.

Wait, the Control Group (left) has plants:

- Plant 1: 8 cm

- Plant 2: 10 cm

- Plant 3: 12 cm

- Plant 4: 14 cm

- Plant 5: 10 cm

Sum: 8+10+12+14+10=54. Average: 54/5=10.8≈11.

Experimental Group (right) has 6 plants:

- Plant 1: 10 cm

- Plant 2: 12 cm

- Plant 3: 10 cm

- Plant 4: 12 cm

- Plant 5: 12 cm

- Plant 6: 10 cm

Sum: 10+12+10+12+12+10=66. Average: 66/6=11.

So both averages are 11? Maybe that's correct.

Step2: Calculate Control Group average

Number of plants in Control Group: Let's assume 5 plants (as per the image, left tray has 5 plants? Wait, the left tray (Control) has 5 plants? The right tray (Experimental) has 6. So Control: 5 plants, Experimental: 6 plants.

Control Group heights: 8, 10, 12, 14, 10 (cm).

Sum = 8 + 10 + 12 + 14 + 10 = 54.

Average = 54 / 5 = 10.8 ≈ 11 cm (rounded to nearest cm).

Step3: Calculate Experimental Group average

Experimental Group heights: 10, 12, 10, 12, 12, 10 (cm).

Sum = 10 + 12 + 10 + 12 + 12 + 10 = 66.

Average = 66 / 6 = 11 cm.

Answer:

Control Group: 11 cm
Exper. Group: 11 cm

(Note: Depending on the exact heights read from the ruler, the averages might vary slightly, but based on the analysis, these are the likely values.)