If the standard deviation of the numbers $-1, 0, 1, k$ is $\sqrt 5$ where $k > 0,$ then $k$ is equal to

  • [JEE MAIN 2019]
  • A

    $4\sqrt {\frac {5}{3}}$

  • B

    $\sqrt 6$

  • C

    $2\sqrt 6$

  • D

    $2\sqrt {\frac {10}{3}}$

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