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We are tasked with finding the probability that Miles is a rollerblader, given the provided table of survey data. Let's break down the problem based on the information provided:

### Table Information:
- **Rollerbladers with kids:** 41
- **Rollerbladers without kids:** 9
- **Non-rollerbladers with kids:** 3
- **Non-rollerbladers without kids:** 9
- **Total number of people:** 62 (sum of the last column)

### Key Information:
- Miles' only known trait is that he is very tall, and no information is provided about whether or not he has kids.
- We are asked to find the probability that Miles is a rollerblader. This is a marginal probability since we do not know if he has kids.

### Approach:
The total number of people surveyed is 62, and we are given that 50 people are rollerbladers (41 with kids and 9 without kids). Therefore, the probability that a randomly selected person is a rollerblader is the ratio of the number of rollerbladers to the total population:

\[
P(\text{Rollerblader}) = \frac{\text{Total Rollerbladers}}{\text{Total People}} = \frac{50}{62}
\]

Let's calculate the probability rounded to the nearest hundredth.The probability that Miles is a rollerblader, rounded to the nearest hundredth, is **0.81**.

Would you like more details, or do you have any questions?

Here are five related questions to deepen your understanding:
1. How would the probability change if we knew Miles had kids?
2. What is the probability that a randomly selected person is not a rollerblader?
3. How do you calculate conditional probabilities in this context?
4. How would the analysis differ if you had data for more traits of people, such as occupation or age?
5. Can the data from this table be used to make broader predictions about rollerbladers in other neighborhoods?

**Tip:** Always verify whether the problem is asking for conditional or marginal probabilities, as this affects how you interpret the data.

John and Lauren are looking for a good neighborhood to raise their children. They want neighbors who have kids and who are fellow rollerbladers as well. The couple surveys a random sample of residents in a particular neighborhood. Their results are in the table. David, Anastasia, and Miles live in the neighborhood. David does not have children. Anastasia has never rollerbladed. All we know about Miles is that he is very tall. Rounded to the nearest hundredth, what is the probability that Miles is a rollerblader?

Find the probability that Miles is a rollerblader based on neighborhood survey data. Understand marginal probability concepts and learn how to compute it using the law of total probability. Suitable for Grades 8-10.

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