The number of observations in a survey is 40. If the mean of the first – McqOptions

MCQOPTIONS

1.	The number of observations in a survey is 40. If the mean of the first 10 observations is 4.5 and that of remaining is 3.5, then the mean of the whole survey is
A.	2.82
B.	3.8
C.	3.75
D.	4.25
Answer» D. 4.25

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