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The average score of 40 students in an exam is 75. If the marks of one student were wrongly entered as 95 instead of 55, what is the correct average?

1. 74.5
2. 76
3. 74
4. 73.5

Correct answer: 74

Solution

The wrong total = 40 × 75 = 3000. Since 95 was entered instead of 55, the total is 40 marks too high, so correct total = 2960. The correct average = 2960/40 = 74.

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