If thirty observation have an average of 20 and 20 observations have a mean of 30 then what is the average of all observations?
A25
B60
C50
D24
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Related Questions:
What is correct about UDC scheme of classification ?
(1) It is faceted classification scheme.
(2) Paul Otlet and Henry La Fontaine are associated with it.
(3) It has relative index.
(4) It use pure notation.
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