The mean of a group of 100 observations was found to be 20. Later it w – McqOptions

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1.	The mean of a group of 100 observations was found to be 20. Later it was found that four observations were incorrect, which were recorded as 21, 21, 18 and 20. What is the mean if the incorrect observations are omitted?
A.	18
B.	20
C.	21
D.	22
Answer» C. 21

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