Important Questions of Statistics Mathematics | Zigya

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51.

If i = 1nxi - a = n and i = 1nxi - a2 = na, n, a1 > 1 then the standard deviation of nobservations  x1, x2,  ... xn is : 

  • a - 1

  • na - 1

  • na - 1

  • a - 1


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