The average score of 50 students in a class test was 70. Later it was found that a score of 45 was misread as 95. What is the correct mean?

Topic: Averages
Subtopic: Correction in Mean

A68

B69

C71

D72

Explanation

Incorrect total = 50 * 70 = 3500. Difference = 45 – 95 = -50. Correct total = 3500 – 50 = 3450. Correct mean = 3450 / 50 = 69.

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