Your 4.875 rounded off is 4.9 to one decimal. When rounding off to one decimal, we look at the second decimal. When the second decimal is 5 or more, we round the first decimal up by one. In this case, the second decimal is 7, and that means we round the first decimal, the 8, up by one, and that makes it 9. That's where the 4.9 came from.
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2.75 rounded off to one decimal place = 2.8
3.91 rounded off to one decimal place = 3.9
99.99 rounded off to one decimal place = 100.0
0.333
1.13 rounded to one decimal place is 1.1