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Question

The mean of 50 observations was calculated as 75. It was later found that one of the observations was misread as 173 instead of 113. The correct mean is

A 76.6 Correct Answer Incorrect Answer
B 76.2 Correct Answer Incorrect Answer
C 75.4 Correct Answer Incorrect Answer
D 73.8 Correct Answer Incorrect Answer
E None of these Correct Answer Incorrect Answer

Solution

Difference = 173 – 113 = 60 Decrease in average = 60/50 = 1.2 Correct mean = 75 – 1.2 = 73.8

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