The average of 10 observations is 60. It was realized later that an observation was misread as 39 in place of 93. The correct average is:
The average of 10 observations = 60 Total of 10 observations = 60×10 = 600 Misread number = 39, right number = 93 By mistake difference in number = 93-39= 54 Now a correct total of 10 observations = 600+54= 654 Average = 654/10 = 65.4
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