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? (in $cm$)

  • A

    $53$

  • B

    $54.5$

  • C

    $55.85$

  • D

    $56.15$

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