The mean of 100 observations was calculated as 40. It was found later on that one of the observations was misread as 83 instead of 53. The correct mean is:

  • Option 1)

    39

  • Option 2)

    39.7

  • Option 3)

    40.3

  • Option 4)

    37

  • Option 5)

    42.7

Answers (1)
R rishi raj

Sum \: of \: 100\: observations = 100*40=4000
53 \: misread \: as \: 83
So \: 30 \: more
New \: sum = 4000-30 = 3970
Avg. = \frac{3970 }{100}= 39.7

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