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Arithmetic Mean and Range

Mean of 9 obs...

Question

Mean of 9 observations was found to be 35.Later on it was detected that an observation 81 was misread as 18. The correct mean of the observation was:

A

45

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B

62

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C

42

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D

52

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Solution

The correct option is C
42

\(Correct Mean = \frac{35\times 9 + (81-18)}{9}=\frac{315+63}{9}=\frac{378}{9}=42

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