An arithmetic student needs at least a 70% average to receive credit for the course. If she scored 70%, 64%, and 72% on the first three exams, what score must she get on the fourth exam to receive credit for the course?
A) x ≥ 72%
B) x ≥ 74%
C) x ≥ 76%
D) x ≥ 79%

Question

Quizplus · Accepted Answer

To achieve at least a 70% average across four exams, the sum of the percentages must be at least 280% (since 70% * 4 = 280%). The student has already scored 70%, 64%, and 72%, which sum to 206%. Therefore, to reach at least 280%, the student needs at least 74% on the fourth exam (280% - 206% = 74%).

An Arithmetic Student Needs at Least a 70% Average to Receive