Answer
Because it is not an unusual event.
Work Step by Step
$p=0.07$
$σ_{p̂}=\sqrt {\frac{p(1−p)}{n}}=\sqrt {\frac{0.07(1-0.07)}{1000}}=0.00778$
$p̂=\frac{82}{1000}=0.082$
But $p̂-p=0.012\lt2σ_{p̂}=0.01556$. So, it is not an unusual event.
(See the Empirical Rule, page 148)
