The answer would be: 5.06.
Its that because you look at the number next to the 6 (the thousandths place 4). You determine if the 6 needs to go up or down by the 4. If the 4 is 4 or under, then the six stays the same. If the 4 was 5 and over, the 6 turns into a 7. And since the 4 is under the 4 and under category, the 6 will stay the same. So its: 5.06
Hope this helps! :D