\[\boxed{\text{4.\ 388}}\]
\[6,4954 \approx 6,50\]
\[6,4954 \approx 6,5\]
\[6,4954 \approx 6\]
\[10,983 \approx 10,98\]
\[10,983 \approx 11,0\]
\[10,983 \approx 11\]
\[3,0(6) \approx 3,07\]
\[3,0(6) \approx 3,1\]
\[3,0(6) \approx 3\]