Rabia's average (arithmetic mean) on her six math tests this marking period is 75. Fortunately for Rabia, her teacher drops each student's lowest grade, thus raising Rabia's average to 85. What was her lowest grade?
- 20
- 25
- 30
- 40
Explanation
Given:
- Average of 6 tests = 75
→ Total marks = 6 × 75 = 450
- After dropping lowest grade, average of 5 tests = 85
→ Total of best 5 tests = 5 × 85 = 425
So, the lowest grade = 450 - 425 = 25
Related MCQs
- 8
- 8.5
- 9
- None of these
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