fool8994 fool8994

09-02-2024
Mathematics

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If
₉ ₉
∑ (xi−5)=9 and ∑(xi−5)² = 45,
ᶦ⁻¹ ᶦ⁻¹
then the standard deviation of the 9 times x₁,x₂,.....,x₉ is

A. 2
B. 4
C. 1
D. 9
E. 3

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