1.

By which formula is combined arithmetic mean estimated?

Answer»

`barX_(12)(X_(1)+X_(2)+...+X_(N))/(N_(1)+N_(2))`
`barX_(12)=(barX_(1)N_(1)+barX_(2)N_(2))/(N_(1)+N_(2))`
`barX_(12)=(barX_(1)+barX_(2))/(N_(1)+N_(2))`
NONE of these

Answer :B


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