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Question

If ¯x is the mean of x1,x2,...,xn and ¯y is the mean of y1,y2,...,yn . If ¯z is the mean of x1,x2,...,xn , y1,y2,...,yn then ¯z is equal to :

A
¯x+¯y
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B
¯x+¯yn
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C
¯x+¯y2
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D
¯x+¯y2n
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