The number of observations in a group is 40. If the average of first 10 is 4.5 and that of the remaining 30 is 3.5, then the average of the whole group is [AMU 1992; DCE 1996]

The number of observations in a group is 40. If the average of first 1

1.	The number of observations in a group is 40. If the average of first 10 is 4.5 and that of the remaining 30 is 3.5, then the average of the whole group is [AMU 1992; DCE 1996]
A.	\[\frac{1}{5}\]
B.	\[\frac{15}{4}\]
C.	4
D.	8
Answer» C. 4

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The number of observations in a group is 40. If the average of first 10 is 4.5 and that of the remaining 30 is 3.5, then the average of the whole group is [AMU 1992; DCE 1996]

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