A group of 100 items has a mean of 55. If the mean of 40 of these items be 61, find the mean of the remaining 60 observations.
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Answer will be 51.
Xc=x1n1+x2n2...Xn×nn/n1+n2
55=61*40+X2*60/100
2440+60X2=5500
60x2=5500-2440
60X2=3060
X2=3060÷60=51
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