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  • 14-02-2024
  • Mathematics
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If Σ (xᵢ - 5) = 9 and If Σ (xᵢ - 5)² = 45 then the standard deviation of the 9 items x₁, x₂,..., x₉ is
ᶦ⁼¹ ᶦ⁼¹

a. 3
b. 9
c. 4
d. 2

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