The mean of 50 observations was 150.It was detected on checking that the value of 185 was misread as 135 for the computation of the mean.Find the correct mean.
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sum of observation=mean×no. of obs.
sum of obs=150×50=7500
new mean=7500-135+185/50
=7550/50
=151
correct mean is 151
sum of obs=150×50=7500
new mean=7500-135+185/50
=7550/50
=151
correct mean is 151
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