Answer
$6.751\times10^{3}$
Work Step by Step
Using $a\times10^n$, where $1\le a\le9,$ and $n$ is an integer, the scientific notation of the given expression, $
6751
,$ is
\begin{array}{l}\require{cancel}
6.751
\times1000
\\\\=
6.751\times10^{3}
.\end{array}