math
posted by Debbie .
a student’s grade in a class is simply the mean of five 100point
exams
a. If the student has grades of 77, 73, 97, and 89 on the first four exams, what is the
students’ grade before taking the last exam?
b. What is the lowest score that the student can earn on the last exam to get an B (80) in the
course?

(77 + 73 + 97 + 89)/4 = ?
(77 + 73 + 97 + 89 + x)/5 = 80
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