Time intervals measured by a clock give the following readings : 

$1.25 \;s , 1.24\; s , 1.27\; s , 1.21 \;s$ and $1.28\; s$ 

What is the percentage relative error of the observations?

  • [NEET 2020]
  • A

    $1.6$

  • B

    $2$

  • C

    $4$

  • D

    $16$

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