1.

The mean of x_(1) andx_2is M_1 and that of x_1, x_2, x_3 ... x_4is M, then the mean of ax_1, ax_(2) , x_(3)//a is

Answer»

`(M_1+M_2)/2`
`(aM_1+(M_2//a))/2`
`1/(2A)[(a^2-1)M_(1)+2M_(2)]`
`1/(2a)[2(a^2-1)M_(1)+M_(2)]`

ANSWER :C


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