Solution
We are given that the variance of the data values in a sample = 144
Since we know that the value of variance is the square of standard deviation.
Therefore, to find the value of standard deviation by using variance, we need to find the square root of the variance.
i.e.
Standard Deviation = $$\sqrt{\text{Variance}}$$
Standard Deviation = $$\sqrt{144}=\sqrt{12^2} = 12$$
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