1.

The mean of a set of observation is \[\bar{x}\]. If each observation is divided by a, a ¹ 0 and then is increased by 10, then the mean of the new set is

A.                 \[\frac{{\bar{x}}}{\alpha }\]  
B.                 \[\frac{\bar{x}+10}{\alpha }\]
C.                 \[\frac{\bar{x}+10\alpha }{\alpha }\]   
D.                 \[\alpha \bar{x}+10\]
Answer» D.                 \[\alpha \bar{x}+10\]


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