Mean of 36 observations is 12.one observation 47 was misread as 74. Find the correct mean.
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Answered by
4
x+y+........................+74/36=12
x+y+..........................+47/36=x+y+..................+74-27/36=
x+y+......................74/36-27/36=12-3/4=45/4
x+y+..........................+47/36=x+y+..................+74-27/36=
x+y+......................74/36-27/36=12-3/4=45/4
Answered by
15
Mean=Sum of observations/Total no of observations
12=Sum/36
Sum=12*36=432
Since, 47 was misread as 74
So, the correct Sum=432-74+47=405
Mean=11.25
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