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Question:

Rachna had an average score of 45 from 6 tests. Her teacher dropped her lowest score, which is 30, and calculated the average of the remaining scores to decide her grade. Which of the following gives her new average score?

(45×5−30)5

(45×5−30)6

(45×6−30)6

(45×6−30)5

Solution:

Average score of 45 in 6 tests = 45 × 6
Her teacher dropped her lowest score = 45 × 6 − 30
Total number of tests considered = 5
Hence, the new formula formed will be (45 × 6 − 30) / 5