Ani measured the height of five plants over a three week experimental. And obtain the following data for the final week in centimeters 15 18, 21,19 and 20 calculate the average height for this group of plants around your answer to the nearest desert.

To calculate the average height for the group of plants, you need to follow these steps:

1. Add up all the heights of the plants: 15 + 18 + 21 + 19 + 20 = 93.

2. Divide the sum (93) by the number of plants (5) to get the average height: 93 / 5 = 18.6.

3. Round your answer to the nearest tenth (one decimal place) because the question asks for the answer to the nearest whole number: The average height is approximately 18.6 cm.

Therefore, the average height for this group of plants is approximately 18.6 centimeters.