The standard deviation of n numbers $$x_{1}$$, $$x_{2}$$, $$x_{3}$$,......, $$x_{n}$$, with mean $$\overline{x}$$ is equal to $$\sqrt{\frac{s}{n}}$$, where S is the sum of the squared differences $$(x_{i} - \overline{x})^{2}$$ for 1 ≤ i ≤ n.
1 < a < b < 9
Quantity A
The standard deviation of the numbers 1, a, 9
Quantity B
The standard deviation of the numbers 1, b, 9