A frequency distribution is entered into a calculator's statistics mode. If the mean is 120.200 and the variance 3455.960, the standard deviation is:

1. Standard deviation is the square root of the variance. 2. So $\delta=\sqrt{3455.960}$. 3. Evaluating gives $58.787$ to three decimal places. 4. Halving the variance, which gives $1727.980$, is not a step in any statistical formula. 5. Reporting the variance itself as the standard deviation confuses the two measures of spread. _Source: NECTA ACSEE 2022 Advanced Mathematics 142/1, Question 1: Calculating Device_