Final answer:
Using statistics from a high school and a community swim team, we can calculate the number of people engaging in sports activities weekly. About 5 out of 60 seniors do after-school sports all four years, and 80 swimmers from the community team practice four times a week.
Step-by-step explanation:
To calculate how many people play volleyball at least once a week, we can use the given statistics from a local high school and community team as examples. First, we determine the number of students who participate in after-school sports all four years of high school, which is approximately 8 percent at the given school.
If 60 seniors are randomly chosen, the expected number is 8 percent of 60, which is 4.8, or essentially 5 students when rounded.
Similarly, for the community swim team, if we want to find out how many of them practice four times a week, we can sum up the individual numbers of advanced, intermediate, and novice swimmers who do so. Advanced swimmers practicing four times are 40, intermediate swimmers are 30, and novice swimmers are 10, totaling 80 swimmers who practice at this frequency.
To illustrate another kind of sports activity, we can draw a Venn diagram for students who play tennis and soccer, which would show the individual and overlapping membership. Lastly, for the community events, Javier's participation is variable, but we know he attends five events 35 percent of the time, which gives us an idea of his involvement frequency.