To find the probability that someone that is undecided is selected, we can use a method to find probability. That is, probability = choices/total outcomes. Here, since there are 5 people that are undecided, and 35 people in total, then the probability is 5/35 or 1/7.
Now, we need to find what 1/7 is as a decimal. We can do this by dividing 1 by 7. Doing this, we get 0.14285714285... Now we need to round to the ten-thousandths place. The number currently in the ten-thousandths place is 8. Since the number behind 8 is 5, we round up. So, that means that the answer is 0.1429