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BITSAT2010MathematicsStatisticsActual

Mean of 25 observations was found to be 78.4. But later on it was found that 96 was misread 69 . The correct mean is

Options

  1. A79.24
  2. B79.48
  3. C80.10
  4. DNone of these

Correct answer

B. 79.48

Step-by-step solution

Mean ( x = x n ) or ( x=n x ) ( x =25 78.4=1960 ) But this ( x ) is incorrect as 96 was misread as 69 . ( aligned & correct x =1960+(96-69)=1987 & correct mean = 1987 25 =79.48 aligned )

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