A data of n observation have mean 2x while another data set of 2nobservation has mean x.then the mean of the combined data set of 3n observation will be......?
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n obsr. Mean = 2x
Thus total sum of obsr =2xn
Same with other
Thus total is=2nx=2xn
Total 2xn +2xn = 4 xn
No. Of terms now=n+2n
=3n
Thus mean =4xn/3n=4x/3
And 4x/3
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