AP EAMCET · Maths · Statistics
If \(\sum_{i=1}^9\left(x_i-5\right)=9\) and \(\sum_{i=1}^9\left(x_i-5\right)^2=45\), then the standard deviation of the nine observations \(\mathrm{x}_1, \mathrm{x}_2, \ldots, \mathrm{x}_9\) is
- A \(2\)
- B \(4\)
- C \(3\)
- D \(9\)
Answer & Solution
Correct Answer
(A) \(2\)
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