Final answer:
The relative frequency of students receiving a grade of 'F' is the number of 'F' grades divided by the total number of students. With 2 'F' grades out of 30 students, the relative frequency, rounded to two decimal places, is 0.07 or 7%.
Step-by-step explanation:
The student is asking about the calculation of relative frequency for a grade 'F' in a set of student grades. To calculate the relative frequency, we sum the total number of students, which is provided by adding the number of students that received each grade. Then, we divide the number of students who received a particular grade by this total. In this case, 2 students have received an 'F', and we need to find out how many students there are in total.
The total number of students is 3 (grade A) + 5 (grade B) + 20 (grade C) + 2 (grade F) = 30 students. Therefore, the relative frequency of students who received a grade of 'F' is calculated by dividing the number of 'F' grades by the total number of students:
RF = Number of 'F' grades / Total number of students = 2 / 30 = 0.0667
When rounded to two decimal places, the relative frequency of grade 'F' is approximately 0.07 or 7%.