Answer
$0.66998$
Work Step by Step
We know that $probability=\frac{number \ of \ good \ outcomes}{number\ of\ all\ outcomes}$. Therefore $probability=\frac{2834}{169+1227+2834}=\frac{2834}{4230}≈0.66998$. No, because it is a voluntary response survey which gives us the answers, the results are unlikely to be good, and it is likely to happen.