A 2331 statistics student has a grade of 86 going into the f

A 2331 statistics student has a grade of 86% going into the final exam. The final exam is worth 20% of the overall grade. What percentage score does the student need on the final exam to ensure she gets at least 80% overall in the class?

Solution

100 % is the final score in the subject

we have in total 2331 that have a grade of 86%

and the final exam is worth 20% of the overall grade

100% --------- 80%

86 % ---------- x

x = 68.8 %

so we have that we have 68.8% in the total grade

and we need at least 80% overall in the class

what score does the student need on the final exam?

80 - 68.8 = 11.2 %

What percentage score does the student need on the final exam to ensure she gets at least 80% overall in the class?

11.2 %