Answer:
Colin is wrong
Step-by-step explanation:
The question is incomplete because the chart or the table which shows the data is not given. I have attached the full question at the bottom. Consult it for better understanding.
We can clearly see in the chart the number of lates in January is 30, while the number of lates in March is 20.
As the half of 30 is 15, not 20, we can say that the statement of Colin is wrong, because the number of lates in March should be 15 to prove his statement true