The mean of 12 observations is 65. Later on it was observed that a number 75 was misread 57. Find the correct mean.
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No of observations =12
Arithematic mean=65
Sum of observations/No of observations =65
Sum of observations/12=65
Sum of observations =780
New sum=780-57+75=793
New arithematic mean=798/12=66.5
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