To find the probability that a person spends their time going to the movies given that they are 31–35 years old, we need to use the data provided for that age group.
From the table:
- The total number of people aged 31–35 years old is 50.
- The number of people aged 31–35 who go to the movies is 21.
The probability can be calculated using the formula:
\[ P(\text{Movies} | \text{31-35}) = \frac{\text{Number of people aged 31-35 who like movies}}{\text{Total number of people aged 31-35}} \]
Substituting the numbers:
\[ P(\text{Movies} | \text{31-35}) = \frac{21}{50} \]
Now, to express this probability as a percentage:
\[ P(\text{Movies} | \text{31-35}) \times 100 = \left( \frac{21}{50} \right) \times 100 = 42% \]
Thus, the probability that a person spends their time going to the movies, given that they are 31–35 years old, is 42%.