use a calculator to compute the average heights of the plants in each group to the nearest centimeter. week…

Explanation:

Step1: Estimate control - group heights

Estimate each plant's height in control group from the ruler. Heights seem to be approximately 15 cm, 15 cm, 15 cm, 15 cm, 15 cm, 15 cm.

Step2: Calculate control - group average

The formula for the average (mean) is $\bar{x}=\frac{\sum_{i = 1}^{n}x_{i}}{n}$. Here, $n = 6$ and $\sum_{i=1}^{6}x_{i}=15 + 15+15+15+15+15=90$. So, $\bar{x}=\frac{90}{6}=15$ cm.

Step3: Estimate experimental - group heights

Estimate each plant's height in experimental group from the ruler. Heights seem to be approximately 20 cm, 20 cm, 20 cm, 20 cm, 20 cm, 20 cm.

Step4: Calculate experimental - group average

Using the average formula with $n = 6$ and $\sum_{i = 1}^{6}x_{i}=20+20+20+20+20+20 = 120$. So, $\bar{x}=\frac{120}{6}=20$ cm.

Answer:

Control Group: 15 cm Exper. Group: 20 cm