The most commonly used method to round a decimal number to the nearest whole number is the following:
For a whole number X
Any number `>= X` and `< X.5` is rounded to X
A number `>= X.5` is rounded to X + 1
For example, taking a few numbers from the list that you have provided, the numbers given are rounded to:
3.2 : 3
0.6 : 1
The rest of the numbers are rounded in a similar way.