The standard deviation of those data will be 9. Then the correct option is D.
It is the measure of the dispersion of statistical data. Dispersion is the extent to which the value is in a variation.
The standard deviation is given as
[tex]\sigma = \sqrt{\dfrac{1}{N} \Sigma (x_1 - \bar{x})^2}[/tex]
Suppose you gather some data and calculate that ∑ (Xi – X)² = 81. Further, you know that N = 9.
Then we have
[tex]\sigma = \sqrt{\dfrac{1}{9} \times 81}[/tex]
On simplifying, we have
σ = √9
σ = 3
Thus, the correct option is D.
More about the standard deviation link is given below.
https://brainly.com/question/12402189
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