The average marks of $40$ students in an English exam is $72 .$ Later it is found that three marks $64 , 62$ and $84$ were wrongly entered as $68,65$ and $73.$ The average after mistakes were rectified is

  • A

    $70$

  • B

    $72$

  • C

    $71.9$

  • D

    $72.1$

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