raju marks on four tests were 74,80,72 and 84 .what marks do raju need in the fifth test to get an average of 80.
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Answer: let the marks of fifth test = x,
mean = sum of total marks / no. of tests
80 = 74 + 80 + 72 + 84 + x / 5
400 = 310 + x
400 - 310 = x
x = 90
hence, required marks by raju in the fifth test = 90
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