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Q.

The Mean of 36 observations is 12. One observation 47 was misread as 74. Find the correct mean.

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a

14.55

b

13.35

c

12.75

d

11.25

answer is B.

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Detailed Solution

detailed_solution_thumbnail

Given, Mean of 36 observations = 12
Total of 36 observations = 36 x 12 = 432
Correct sum of 36 observations = 432 – 74 + 47 = 405
Hence, The Correct mean of 36 observations =  40536 = 11.25

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