A student scores an average of 70 marks in the first 4 tests.
What must he score in the 5th test to have an overall average of 75?
Show answer & explanation
Correct answer: B
Explanation
Average of the first 4 tests = 70; Total tests = 5; New average = 75
Total marks for the first 4 tests = 70 × 4 = 280
Total marks for 5 tests = 75 × 5 = 375
Marks in the 5th test = 375 − 280 = 95 marks