Question

in a survey, 250 adults and children were asked whether they know how to swim. the survey data are shown in the relative - frequency table.

	can swim	cannot swim	total
children	0.48	0.12
total

what percentage of the people surveyed are adults?
a. 6%
b. 40%
c. 34%
d. 82%

Explanation:

Step1: Find the relative - frequency of adults

The relative - frequency of adults who can swim is 0.34 and the relative - frequency of adults who cannot swim is 0.06.

Step2: Calculate the total relative - frequency of adults

To find the total relative - frequency of adults, we add the relative - frequencies of adults who can swim and adults who cannot swim. So, \(0.34 + 0.06=0.4\).

Step3: Convert the relative - frequency to a percentage

To convert 0.4 to a percentage, we multiply by 100. \(0.4\times100 = 40\%\).

Answer:

B. 40%