Answer
$0.65$
Work Step by Step
We know that probability$=\frac{\text{number of favourable outcomes}}{\text{number of all outcomes}}.$
We have $100$ households in total. There are $35+30=65$ households whose income are from $\$10,000$ to $\$29,999$.
Thus,
$P=\frac{65}{100}=0.65$
