Anvils measured the height of five plants over a three-week experimental period and obtained the following data for the final week (in cm):
15, 18, 21, 19, 20
Calculate the final average height for this group of plants. Round your answer to one decimal place.
To calculate the final average height for this group of plants, you need to find the sum of the heights and divide it by the number of plants.
The sum of the heights is 15 + 18 + 21 + 19 + 20 = 93 cm.
There are five plants in the group.
So, the final average height is 93 cm / 5 = <<93/5=18.6>>18.6 cm.
Rounded to one decimal place, the final average height for this group of plants is 18.6 cm. Answer: \boxed{18.6}.