the mean of 15observation is 28.if the mean of first 8 observation is 25 and that of the last 8 observation is 30 find the 8th observations
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Either:
28*15=420, (25*8)=200, (30*8)=240,sum=440
so 8th observ=440-420=20
Either:
28*15=420, (25*8)=200, (30*8)=240,sum=440
so 8th observ=440-420=20
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