There are 8 houses on a street, numbered 1 through 8. House number 4 is painted blue, while all the other houses are painted white. If you randomly choose one house to visit, what is the probability that it is not painted blue?
The probability is 7/8.

Here's the reasoning:
1. We know there are 8 houses in total, with only 1 house (number 4) painted blue.
2. This means that there are 7 houses (numbers 1, 2, 3, 5, 6, 7, and 8) that are not painted blue.
3. To find the probability of choosing a house that is not painted blue, we divide the number of favorable outcomes (not blue houses) by the total number of possible outcomes (all houses).
4. So, the probability is 7/8.