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If sum(i=1)^9 (xi-5)=9 and sum(i=1)^9 (...

If `sum_(i=1)^9 (x_i-5)=9 and sum_(i=1)^9 (x_i-5)^2=45` then the standard deviation of the 9 items `x_1,x_2,.....,x_9` is

A

4

B

2

C

3

D

9

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The correct Answer is:
B
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