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Question

If mean of x1,x2.........xn is y then means of b−ax1,b−ax2........b−axn is

A
ayb
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B
b+ay
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C
bay
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D
by+a
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Solution

The correct option is C bay

Given the mean of x_1,x_2,.....,x_n is y

x1+x2+.....+xnn=yx1+x2+.....+xn=ny

Means of bax1,bax2,.....,baxn is

=bax1+bax2+.....+baxnn=(b+b+...+bntimes)ax1ax2.....axnn=bna(x1+x2+.....+xn)n=bna(ny)n=bnnanyn=bay

So Means of bax1,bax2,.....,baxn is bay


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