Answer:
The relative frequency of landing on green can be calculated by dividing the number of times the counter landed on green by the total number of trials (400):
Relative frequency of green = Number of times landed on green / Total number of trials
Relative frequency of green = 80 / 400
Relative frequency of green = 0.2
So, the relative frequency of landing on green is 0.2, which can also be expressed as 20%.