Question

To get a B in math, a student must score an average of at least 80 on five tests. On the first four tests, a student's scores were 76, 92, 64, and 81. What must the student score on their last test to earn a B average?

Answer 1

To earn a B average, the student must score an average of at least 80 on five tests. The first four tests have an average score of (76 + 92 + 64 + 81) / 4 = 78.25. To get an average of 80 on five tests, the student must score a total of 80 x 5 = 400 points. So, the student must score 400 - (78.25 x 4) = 87.5 on their last test to earn a B average.