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| Math Central | Quandaries & Queries |
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Question from Abhishek, a student: Mean of 50 observations was found to be 80.4 but later all it was discovered 96 was mistake at 69 |
Hi Abhishek,
Suppose that the sum of the 50 observations is $S,$ then you know that
\[\frac{S}{50} = 80.4\]
or
\[S = 50 \times 80.4 = 4020.\]
How much does that sum $S$ change after fixing the error? What is the new mean?
Penny
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