Sure, let's walk through the steps to calculate the final average height for the group of plants based on the provided data.
1. List the Heights: First, we gather the heights of the five plants:
- Plant 1: 15 cm
- Plant 2: 18 cm
- Plant 3: 21 cm
- Plant 4: 19 cm
- Plant 5: 20 cm
2. Calculate the Total Sum of Heights:
Add up the heights of all the plants:
[tex]\[
15 + 18 + 21 + 19 + 20 = 93 \text{ cm}
\][/tex]
3. Count the Number of Plants:
There are five plants in total.
4. Calculate the Average Height:
The average height is found by dividing the total sum of heights by the number of plants:
[tex]\[
\text{Average height} = \frac{\text{Total sum of heights}}{\text{Number of plants}} = \frac{93}{5} = 18.6 \text{ cm}
\][/tex]
5. Round the Average Height:
The average height is already at one decimal place, so rounding 18.6 to one decimal place remains 18.6.
Therefore, the final average height for the group of plants is 18.6 cm.
