A student measures the time period of $100$ oscillations of a simple pendulum four times. The data set is  $90\;s$ ,$91\;s $, $95\;s$ and $92\;s$. If the minimum division in the  measuring clock is $1\;s$, then the reported mean time should be

  • [JEE MAIN 2016]
  • A

    $92\pm 2\;s$

  • B

    $92\pm 3\;s$ 

  • C

    $92\pm 1.8\;s$ 

  • D

    $92\pm 5\;s$

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