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Q:

The average of a collection of 20 measurements was calculated to be 56 cm . But later it was found that a mistake had occurred in one of the measurements which was recorded as 64 cm, but should have been 61 cm. The correct average must be: 

  • 1
    55.85 cm
  • 2
    56.15 cm
  • 3
    53 cm
  • 4
    54.5 cm
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Answer : 1. "55.85 cm "

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