Question 547605
Total Score in first four tests = 80+90+84+91=345
Score in fifth test = x
Total score in five tests = 345+x
Total number of tests = 5
Average in five test = 88



sum of quantities / number of quantities = Average
(345+x)/5 = 88
345+x=88*5
345+x=440
x=440-345
x=95

Brad has to score 95 in fifth test to get an average of 88.