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Answer :
The percentage of adults in the survey is A) 40%.
We know that:
- The total number of people surveyed is 250.
- The frequency of adults who can swim is 0.34, and of adults who cannot swim is 0.06.
- Therefore, the total relative frequency for adults can be calculated by adding the corresponding values in the table: 0.34 + 0.06 = 0.40.
This means that adults make up 40% of the total survey population.
Now we calculate the actual number of adults:
Since the relative frequency of adults is 0.40, we multiply this proportion by the total number of surveyed individuals:
Number of adults = Total surveyed × Relative frequency of adults
Number of adults = 250 × 0.40 = 100.
Now to find the percentage of people surveyed who are adults:
Percentage of adults = (Number of adults / Total surveyed) × 100
Percentage of adults = (100 / 250) × 100 = 40%.
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