The mean and standard deviation of 20 observations are found to be | Filo
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Class 11

Math

JEE Main Questions

Statistics

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The mean and standard deviation of 20 observations are found to be 10 and 2, respectively. One rechecking, it was found that an observation 8 was incorrect. Calculate the correct mean and standard deviation in each of the following cases. (i)      If wrong item is omitted(ii)     If it is replaced by 12.

Solution: Solution:

for 19 terms

let incorrect sum be


correct for 19 terms =
(i)


(ii) n = 20




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