We need to find the relative frequency of the eighth-graders who chose the fruit smoothies.
To find a relative frequency we need to divide the number of people from eight grade who chose fruit smoothies, shown in the following image:
Divide that number by the total number of people in eighth grade:
Thus, we get the following:
[tex]\text{relative frequency=}\frac{Number\text{ of eighth graders who want smoothies}}{\text{Total number of eighth graders}}[/tex]
Substituting our values:
[tex]\text{relative frequency=}\frac{17}{250}[/tex]
Solving the division:
[tex]\text{relative frequency =}0.068[/tex]